[FIR2IR] Populate overridden symbols even for !isOverride

Before this commit we considered !isOverride as a sign that
function / field / accessor has no overridden symbols.
However, it's false for deserialized, because isOverride
is always false there.

This commit fixes 68 BB tests but breaks 25 BB tests (not yet muted)

compiler/testData/ir/irText/classes/delegatedImplementation.fir.txt

@@ -155,6 +155,8 @@ FILE fqName:<root> fileName:/delegatedImplementation.kt
             PROPERTY name:z1 visibility:public modality:FINAL [val]
               FUN name:<get-z1> visibility:public modality:FINAL <> ($this:<root>.otherImpl.<no name provided>, $receiver:kotlin.Byte) returnType:kotlin.Int
                 correspondingProperty: PROPERTY name:z1 visibility:public modality:FINAL [val]
+                overridden:
+                  public abstract fun <get-z1> (): kotlin.Int declared in <root>.IOther
                 $this: VALUE_PARAMETER name:<this> type:<root>.otherImpl.<no name provided>
                 $receiver: VALUE_PARAMETER name:<this> type:kotlin.Byte
                 BLOCK_BODY
@@ -163,6 +165,8 @@ FILE fqName:<root> fileName:/delegatedImplementation.kt
             PROPERTY name:z2 visibility:public modality:FINAL [var]
               FUN name:<get-z2> visibility:public modality:FINAL <> ($this:<root>.otherImpl.<no name provided>, $receiver:kotlin.Byte) returnType:kotlin.Int
                 correspondingProperty: PROPERTY name:z2 visibility:public modality:FINAL [var]
+                overridden:
+                  public abstract fun <get-z2> (): kotlin.Int declared in <root>.IOther
                 $this: VALUE_PARAMETER name:<this> type:<root>.otherImpl.<no name provided>
                 $receiver: VALUE_PARAMETER name:<this> type:kotlin.Byte
                 BLOCK_BODY
@@ -170,6 +174,8 @@ FILE fqName:<root> fileName:/delegatedImplementation.kt
                     CONST Int type=kotlin.Int value=2
               FUN name:<set-z2> visibility:public modality:FINAL <> ($this:<root>.otherImpl.<no name provided>, $receiver:kotlin.Byte, value:kotlin.Int) returnType:kotlin.Unit
                 correspondingProperty: PROPERTY name:z2 visibility:public modality:FINAL [var]
+                overridden:
+                  public abstract fun <set-z2> (<set-?>: kotlin.Int): kotlin.Unit declared in <root>.IOther
                 $this: VALUE_PARAMETER name:<this> type:<root>.otherImpl.<no name provided>
                 $receiver: VALUE_PARAMETER name:<this> type:kotlin.Byte
                 VALUE_PARAMETER name:value index:0 type:kotlin.Int

compiler/testData/ir/irText/classes/qualifiedSuperCalls.fir.txt

@@ -68,6 +68,9 @@ FILE fqName:<root> fileName:/qualifiedSuperCalls.kt
     PROPERTY name:bar visibility:public modality:FINAL [val]
       FUN name:<get-bar> visibility:public modality:FINAL <> ($this:<root>.CBoth) returnType:kotlin.Int
         correspondingProperty: PROPERTY name:bar visibility:public modality:FINAL [val]
+        overridden:
+          public open fun <get-bar> (): kotlin.Int declared in <root>.ILeft
+          public open fun <get-bar> (): kotlin.Int declared in <root>.IRight
         $this: VALUE_PARAMETER name:<this> type:<root>.CBoth
         BLOCK_BODY
           RETURN type=kotlin.Nothing from='public final fun <get-bar> (): kotlin.Int declared in <root>.CBoth'

compiler/testData/ir/irText/classes/superCalls.fir.txt

@@ -50,6 +50,8 @@ FILE fqName:<root> fileName:/superCalls.kt
     PROPERTY name:bar visibility:public modality:FINAL [val]
       FUN name:<get-bar> visibility:public modality:FINAL <> ($this:<root>.Derived) returnType:kotlin.String
         correspondingProperty: PROPERTY name:bar visibility:public modality:FINAL [val]
+        overridden:
+          public open fun <get-bar> (): kotlin.String declared in <root>.Base
         $this: VALUE_PARAMETER name:<this> type:<root>.Derived
         BLOCK_BODY
           RETURN type=kotlin.Nothing from='public final fun <get-bar> (): kotlin.String declared in <root>.Derived'