[IR] Don't use the GET_PROPERTY origin on IrGetField expressions.

This origin was set somewhat arbitrarily.
It actually only makes sense for `IrCall`s to property getters.
There were no places in lowerings that checked `IrGetField` expressions
for this origin value.

^KT-62500 Fixed

compiler/testData/ir/irText/firProblems/OutBox.fir.ir.txt

@@ -33,7 +33,7 @@ FILE fqName:<root> fileName:/Box.kt
               then: BLOCK type=kotlin.Unit origin=null
                 RETURN type=kotlin.Nothing from='public final fun <get-str> (): kotlin.String declared in <root>.Box'
                   TYPE_OP type=kotlin.String origin=IMPLICIT_NOTNULL typeOperand=kotlin.String
-                    GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:str type:@[FlexibleNullability] kotlin.String? visibility:public' type=@[FlexibleNullability] kotlin.String? origin=GET_PROPERTY
+                    GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:str type:@[FlexibleNullability] kotlin.String? visibility:public' type=@[FlexibleNullability] kotlin.String? origin=null
                       receiver: TYPE_OP type=<root>.Foo.Buz origin=IMPLICIT_CAST typeOperand=<root>.Foo.Buz
                         GET_VAR 'var foo: <root>.Foo declared in <root>.Box.<get-str>' type=<root>.Foo origin=null
           RETURN type=kotlin.Nothing from='public final fun <get-str> (): kotlin.String declared in <root>.Box'

compiler/testData/ir/irText/firProblems/OutBox.ir.txt

@@ -33,7 +33,7 @@ FILE fqName:<root> fileName:/Box.kt
               then: BLOCK type=kotlin.Unit origin=null
                 RETURN type=kotlin.Nothing from='public final fun <get-str> (): kotlin.String declared in <root>.Box'
                   TYPE_OP type=kotlin.String origin=IMPLICIT_NOTNULL typeOperand=kotlin.String
-                    GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:str type:@[FlexibleNullability] kotlin.String? visibility:public' type=@[FlexibleNullability] kotlin.String? origin=GET_PROPERTY
+                    GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:str type:@[FlexibleNullability] kotlin.String? visibility:public' type=@[FlexibleNullability] kotlin.String? origin=null
                       receiver: TYPE_OP type=<root>.Foo.Buz origin=IMPLICIT_CAST typeOperand=<root>.Foo.Buz
                         GET_VAR 'var foo: <root>.Foo declared in <root>.Box.<get-str>' type=<root>.Foo origin=null
           RETURN type=kotlin.Nothing from='public final fun <get-str> (): kotlin.String declared in <root>.Box'

compiler/testData/ir/irText/firProblems/elvisOnBackingFieldInGetter.fir.ir.txt

@@ -17,12 +17,12 @@ FILE fqName:<root> fileName:/elvisOnBackingFieldInGetter.kt
             BRANCH
               if: CALL 'public final fun not (): kotlin.Boolean declared in kotlin.Boolean' type=kotlin.Boolean origin=EXCLEQ
                 $this: CALL 'public final fun EQEQ (arg0: kotlin.Any?, arg1: kotlin.Any?): kotlin.Boolean declared in kotlin.internal.ir' type=kotlin.Boolean origin=EXCLEQ
-                  arg0: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:resourceTable type:<root>.ResourceTable? visibility:private' type=<root>.ResourceTable? origin=GET_PROPERTY
+                  arg0: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:resourceTable type:<root>.ResourceTable? visibility:private' type=<root>.ResourceTable? origin=null
                     receiver: GET_VAR '<this>: <root>.Test declared in <root>.Test.<get-resourceTable>' type=<root>.Test origin=null
                   arg1: CONST Null type=kotlin.Nothing? value=null
               then: BLOCK type=kotlin.Unit origin=null
                 RETURN type=kotlin.Nothing from='public final fun <get-resourceTable> (): <root>.ResourceTable? declared in <root>.Test'
-                  GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:resourceTable type:<root>.ResourceTable? visibility:private' type=<root>.ResourceTable? origin=GET_PROPERTY
+                  GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:resourceTable type:<root>.ResourceTable? visibility:private' type=<root>.ResourceTable? origin=null
                     receiver: GET_VAR '<this>: <root>.Test declared in <root>.Test.<get-resourceTable>' type=<root>.Test origin=null
           VAR name:fileData type:kotlin.String? [val]
             CALL 'public final fun getFileData (): kotlin.String? declared in <root>.Test' type=kotlin.String? origin=null
@@ -40,7 +40,7 @@ FILE fqName:<root> fileName:/elvisOnBackingFieldInGetter.kt
           RETURN type=kotlin.Nothing from='public final fun <get-resourceTable> (): <root>.ResourceTable? declared in <root>.Test'
             BLOCK type=<root>.ResourceTable origin=ELVIS
               VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.ResourceTable? [val]
-                GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:resourceTable type:<root>.ResourceTable? visibility:private' type=<root>.ResourceTable? origin=GET_PROPERTY
+                GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:resourceTable type:<root>.ResourceTable? visibility:private' type=<root>.ResourceTable? origin=null
                   receiver: GET_VAR '<this>: <root>.Test declared in <root>.Test.<get-resourceTable>' type=<root>.Test origin=null
               WHEN type=<root>.ResourceTable origin=null
                 BRANCH

compiler/testData/ir/irText/firProblems/typeParameterFromJavaClass.fir.ir.txt

@@ -11,5 +11,5 @@ FILE fqName:<root> fileName:/typeParameterFromJavaClass.kt
             BLOCK_BODY
               TYPE_OP type=kotlin.Unit origin=IMPLICIT_COERCION_TO_UNIT typeOperand=kotlin.Unit
                 CALL 'public abstract fun getName (): @[FlexibleNullability] kotlin.String? declared in <root>.FilePath' type=@[FlexibleNullability] kotlin.String? origin=GET_PROPERTY
-                  $this: GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:second type:@[FlexibleNullability] B of <root>.Pair? visibility:public [final]' type=@[FlexibleNullability] <root>.FilePath? origin=GET_PROPERTY
+                  $this: GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:second type:@[FlexibleNullability] B of <root>.Pair? visibility:public [final]' type=@[FlexibleNullability] <root>.FilePath? origin=null
                     receiver: GET_VAR 'it: <root>.Couple<<root>.FilePath> declared in <root>.foo.<anonymous>' type=<root>.Couple<<root>.FilePath> origin=null

compiler/testData/ir/irText/firProblems/typeParameterFromJavaClass.ir.txt

@@ -12,5 +12,5 @@ FILE fqName:<root> fileName:/typeParameterFromJavaClass.kt
               TYPE_OP type=kotlin.Unit origin=IMPLICIT_COERCION_TO_UNIT typeOperand=kotlin.Unit
                 CALL 'public abstract fun getName (): @[FlexibleNullability] kotlin.String? declared in <root>.FilePath' type=@[FlexibleNullability] kotlin.String? origin=GET_PROPERTY
                   $this: TYPE_OP type=<root>.FilePath origin=IMPLICIT_NOTNULL typeOperand=<root>.FilePath
-                    GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:second type:@[FlexibleNullability] B of <root>.Pair? visibility:public [final]' type=@[FlexibleNullability] <root>.FilePath? origin=GET_PROPERTY
+                    GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:second type:@[FlexibleNullability] B of <root>.Pair? visibility:public [final]' type=@[FlexibleNullability] <root>.FilePath? origin=null
                       receiver: GET_VAR 'it: <root>.Couple<<root>.FilePath> declared in <root>.foo.<anonymous>' type=<root>.Couple<<root>.FilePath> origin=null