[FIR] Fix false positive USELESS_CAST on stub types, ^KT-50293 Fixed

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/BuilderConfigurator.kt

@@ -265,6 +265,7 @@ object BuilderConfigurator : AbstractBuilderConfigurator<FirTreeBuilder>(FirTree
 
         builder(resolvedTypeRef) {
             defaultNull("delegatedTypeRef")
+            default("isFromStubType", "false")
             withCopy()
         }
 

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/ImplementationConfigurator.kt

@@ -224,7 +224,7 @@ object ImplementationConfigurator : AbstractFirTreeImplementationConfigurator()
                 "getter", "setter",
                 withGetter = true
             )
-            default("returnTypeRef", "FirErrorTypeRefImpl(null, null, diagnostic)")
+            default("returnTypeRef", "FirErrorTypeRefImpl(null, null, diagnostic, false)")
             useTypes(errorTypeRefImplType)
         }
 
@@ -421,13 +421,13 @@ object ImplementationConfigurator : AbstractFirTreeImplementationConfigurator()
         }
 
         impl(errorExpression) {
-            default("typeRef", "FirErrorTypeRefImpl(source, null, ConeStubDiagnostic(diagnostic))")
+            default("typeRef", "FirErrorTypeRefImpl(source, null, ConeStubDiagnostic(diagnostic), false)")
             useTypes(errorTypeRefImplType, coneStubDiagnosticType)
         }
 
         impl(errorFunction) {
             defaultNull("receiverTypeRef", "body", withGetter = true)
-            default("returnTypeRef", "FirErrorTypeRefImpl(null, null, diagnostic)")
+            default("returnTypeRef", "FirErrorTypeRefImpl(null, null, diagnostic, false)")
             useTypes(errorTypeRefImplType)
         }
 

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/NodeConfigurator.kt

@@ -637,6 +637,7 @@ object NodeConfigurator : AbstractFieldConfigurator<FirTreeBuilder>(FirTreeBuild
         resolvedTypeRef.configure {
             +field("type", coneKotlinTypeType)
             +field("delegatedTypeRef", typeRef, nullable = true)
+            +booleanField("isFromStubType")
         }
 
         typeRefWithNullability.configure {