FIR2IR: set 'SetField' type to Unit, convert explicit 'this' references

compiler/testData/ir/irText/declarations/provideDelegate/differentReceivers.fir.txt

@@ -37,14 +37,14 @@ FILE fqName:<root> fileName:/differentReceivers.kt
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun provideDelegate (host: kotlin.Any?, p: kotlin.Any): kotlin.String declared in <root>'
         CALL 'public final fun <get-value> (): kotlin.String declared in <root>.MyClass' type=kotlin.String origin=null
-          $this: ERROR_CALL 'Unresolved reference: this#' type=<root>.MyClass
+          $this: GET_VAR '<this>: <root>.MyClass declared in <root>.provideDelegate' type=<root>.MyClass origin=null
   FUN name:getValue visibility:public modality:FINAL <> ($receiver:kotlin.String, receiver:kotlin.Any?, p:kotlin.Any) returnType:kotlin.String
     $receiver: VALUE_PARAMETER name:<this> type:kotlin.String
     VALUE_PARAMETER name:receiver index:0 type:kotlin.Any?
     VALUE_PARAMETER name:p index:1 type:kotlin.Any
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun getValue (receiver: kotlin.Any?, p: kotlin.Any): kotlin.String declared in <root>'
-        ERROR_CALL 'Unresolved reference: this#' type=kotlin.String
+        GET_VAR '<this>: kotlin.String declared in <root>.getValue' type=kotlin.String origin=null
   PROPERTY name:testO visibility:public modality:FINAL [delegated,val]
     FIELD DELEGATE name:testO$delegate type:kotlin.String visibility:private [final,static]
       EXPRESSION_BODY

compiler/testData/ir/irText/declarations/provideDelegate/localDifferentReceivers.fir.txt

@@ -37,14 +37,14 @@ FILE fqName:<root> fileName:/localDifferentReceivers.kt
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun provideDelegate (host: kotlin.Any?, p: kotlin.Any): kotlin.String declared in <root>'
         CALL 'public final fun <get-value> (): kotlin.String declared in <root>.MyClass' type=kotlin.String origin=null
-          $this: ERROR_CALL 'Unresolved reference: this#' type=<root>.MyClass
+          $this: GET_VAR '<this>: <root>.MyClass declared in <root>.provideDelegate' type=<root>.MyClass origin=null
   FUN name:getValue visibility:public modality:FINAL <> ($receiver:kotlin.String, receiver:kotlin.Any?, p:kotlin.Any) returnType:kotlin.String
     $receiver: VALUE_PARAMETER name:<this> type:kotlin.String
     VALUE_PARAMETER name:receiver index:0 type:kotlin.Any?
     VALUE_PARAMETER name:p index:1 type:kotlin.Any
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun getValue (receiver: kotlin.Any?, p: kotlin.Any): kotlin.String declared in <root>'
-        ERROR_CALL 'Unresolved reference: this#' type=kotlin.String
+        GET_VAR '<this>: kotlin.String declared in <root>.getValue' type=kotlin.String origin=null
   FUN name:box visibility:public modality:FINAL <> () returnType:kotlin.String
     BLOCK_BODY
       VAR name:testO type:kotlin.String [val]

compiler/testData/ir/irText/declarations/provideDelegate/member.fir.txt

@@ -88,7 +88,7 @@ FILE fqName:<root> fileName:/member.kt
           CALL 'public final fun provideDelegate (thisRef: kotlin.Any?, property: kotlin.Any?): <root>.Delegate declared in <root>.DelegateProvider' type=<root>.Delegate origin=null
             $this: CONSTRUCTOR_CALL 'public constructor <init> (value: kotlin.String) [primary] declared in <root>.DelegateProvider' type=<root>.DelegateProvider origin=null
               value: CONST String type=kotlin.String value="OK"
-            thisRef: ERROR_CALL 'Unresolved reference: this#' type=<root>.Host
+            thisRef: GET_VAR '<this>: <root>.Host declared in <root>.Host' type=<root>.Host origin=null
             property: PROPERTY_REFERENCE 'public final testMember: kotlin.String [delegated,val]' field=null getter=null setter=null type=kotlin.reflect.KProperty<*> origin=null
       FUN DELEGATED_PROPERTY_ACCESSOR name:<get-testMember> visibility:public modality:FINAL <> ($this:<root>.Host) returnType:kotlin.String
         correspondingProperty: PROPERTY name:testMember visibility:public modality:FINAL [delegated,val]
@@ -97,7 +97,7 @@ FILE fqName:<root> fileName:/member.kt
           RETURN type=kotlin.Nothing from='public final fun <get-testMember> (): kotlin.String declared in <root>.Host'
             CALL 'public final fun getValue (thisRef: kotlin.Any?, property: kotlin.Any?): kotlin.String declared in <root>.Delegate' type=kotlin.String origin=null
               $this: GET_FIELD 'FIELD DELEGATE name:testMember$delegate type:<root>.Delegate visibility:private [final]' type=<root>.Delegate origin=GET_PROPERTY
-              thisRef: ERROR_CALL 'Unresolved reference: this#' type=<root>.Host
+              thisRef: GET_VAR '<this>: <root>.Host declared in <root>.Host' type=<root>.Host origin=null
               property: PROPERTY_REFERENCE 'public final testMember: kotlin.String [delegated,val]' field='FIELD DELEGATE name:testMember$delegate type:<root>.Delegate visibility:private [final]' getter=null setter=null type=kotlin.reflect.KProperty<*> origin=null
     FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean
       overridden:

compiler/testData/ir/irText/declarations/provideDelegate/memberExtension.fir.txt

@@ -53,13 +53,13 @@ FILE fqName:<root> fileName:/memberExtension.kt
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public final fun provideDelegate (host: kotlin.Any?, p: kotlin.Any): <root>.Host.StringDelegate declared in <root>.Host'
           CONSTRUCTOR_CALL 'public constructor <init> (s: kotlin.String) [primary] declared in <root>.Host.StringDelegate' type=<root>.Host.StringDelegate origin=null
-            s: ERROR_CALL 'Unresolved reference: this#' type=kotlin.String
+            s: GET_VAR '<this>: kotlin.String declared in <root>.Host.provideDelegate' type=kotlin.String origin=null
     PROPERTY name:plusK visibility:public modality:FINAL [delegated,val]
       FIELD DELEGATE name:plusK$delegate type:<root>.Host.StringDelegate visibility:private [final]
         EXPRESSION_BODY
           CALL 'public final fun provideDelegate (host: kotlin.Any?, p: kotlin.Any): <root>.Host.StringDelegate declared in <root>.Host' type=<root>.Host.StringDelegate origin=null
             $this: CONST String type=kotlin.String value="K"
-            host: ERROR_CALL 'Unresolved reference: this#' type=<root>.Host
+            host: GET_VAR '<this>: <root>.Host declared in <root>.Host' type=<root>.Host origin=null
             p: PROPERTY_REFERENCE 'public final plusK: IrErrorType [delegated,val]' field=null getter=null setter=null type=kotlin.reflect.KProperty<*> origin=null
       FUN DELEGATED_PROPERTY_ACCESSOR name:<get-plusK> visibility:public modality:FINAL <> ($this:<root>.Host) returnType:IrErrorType
         correspondingProperty: PROPERTY name:plusK visibility:public modality:FINAL [delegated,val]
@@ -67,7 +67,7 @@ FILE fqName:<root> fileName:/memberExtension.kt
         BLOCK_BODY
           RETURN type=kotlin.Nothing from='public final fun <get-plusK> (): IrErrorType declared in <root>.Host'
             ERROR_CALL 'Unresolved reference: <Inapplicable(INAPPLICABLE): [/Host.StringDelegate.getValue]>#' type=IrErrorType
-              ERROR_CALL 'Unresolved reference: this#' type=<root>.Host
+              GET_VAR '<this>: <root>.Host declared in <root>.Host' type=<root>.Host origin=null
               PROPERTY_REFERENCE 'public final plusK: IrErrorType [delegated,val]' field='FIELD DELEGATE name:plusK$delegate type:<root>.Host.StringDelegate visibility:private [final]' getter=null setter=null type=kotlin.reflect.KProperty<*> origin=null
     PROPERTY name:ok visibility:public modality:FINAL [val]
       FIELD PROPERTY_BACKING_FIELD name:ok type:IrErrorType visibility:public [final]