Split stub types into stub type for subtyping and for builder inference and use them in the proper way

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/components/ClassicTypeSystemContextForCS.kt

@@ -73,8 +73,11 @@ class ClassicTypeSystemContextForCS(override val builtIns: KotlinBuiltIns) : Typ
         }
     }
 
-    override fun createStubType(typeVariable: TypeVariableMarker): StubTypeMarker {
-        return StubType(typeVariable.freshTypeConstructor() as TypeConstructor, typeVariable.defaultType().isMarkedNullable())
+    override fun createStubTypeForBuilderInference(typeVariable: TypeVariableMarker): StubTypeMarker {
+        return StubTypeForBuilderInference(
+            typeVariable.freshTypeConstructor() as TypeConstructor,
+            typeVariable.defaultType().isMarkedNullable()
+        )
     }
 
     override fun createStubTypeForTypeVariablesInSubtyping(typeVariable: TypeVariableMarker): StubTypeMarker {

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/components/ExternalComponents.kt

@@ -18,7 +18,7 @@ import org.jetbrains.kotlin.resolve.calls.results.SimpleConstraintSystem
 import org.jetbrains.kotlin.resolve.calls.tower.ImplicitScopeTower
 import org.jetbrains.kotlin.resolve.constants.IntegerValueTypeConstant
 import org.jetbrains.kotlin.types.KotlinType
-import org.jetbrains.kotlin.types.StubType
+import org.jetbrains.kotlin.types.StubTypeForBuilderInference
 import org.jetbrains.kotlin.types.UnwrappedType
 
 // stateless component
@@ -73,7 +73,7 @@ interface KotlinResolutionCallbacks {
         parameters: List<UnwrappedType>,
         expectedReturnType: UnwrappedType?, // null means, that return type is not proper i.e. it depends on some type variables
         annotations: Annotations,
-        stubsForPostponedVariables: Map<NewTypeVariable, StubType>,
+        stubsForPostponedVariables: Map<NewTypeVariable, StubTypeForBuilderInference>,
     ): ReturnArgumentsAnalysisResult
 
     fun bindStubResolvedCallForCandidate(candidate: ResolvedCallAtom)