[NI] Fix common supertype of types with error supertypes

Enable check for error supertypes during CST calculation in classic type system context.
Cyclic upper bound + known type parameters of superclasses may create non-error types
with error supertypes. Such types don't have common constructors with other normal types
and cause assertion errors during intersection.

^KT-36951 Fixed

core/descriptors/src/org/jetbrains/kotlin/types/checker/ClassicTypeSystemContext.kt

@@ -33,7 +33,7 @@ import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.contract
 
 interface ClassicTypeSystemContext : TypeSystemInferenceExtensionContext, TypeSystemCommonBackendContext {
-    override val isErrorTypeAllowed: Boolean get() = true
+    override val isErrorTypeAllowed: Boolean get() = false
 
     override fun TypeConstructorMarker.isDenotable(): Boolean {
         require(this is TypeConstructor, this::errorMessage)
@@ -62,7 +62,8 @@ interface ClassicTypeSystemContext : TypeSystemInferenceExtensionContext, TypeSy
     }
 
     override fun TypeConstructorMarker.toErrorType(): SimpleTypeMarker {
-        throw IllegalStateException("Should not be called")
+        require(this is TypeConstructor && ErrorUtils.isError(declarationDescriptor), this::errorMessage)
+        return ErrorUtils.createErrorType("from type constructor(${toString()})")
     }
 
     override fun KotlinTypeMarker.isUninferredParameter(): Boolean {
@@ -529,7 +530,8 @@ interface ClassicTypeSystemContext : TypeSystemInferenceExtensionContext, TypeSy
     }
 
     override fun TypeConstructorMarker.isError(): Boolean {
-        throw IllegalStateException("Should not be called")
+        require(this is TypeConstructor, this::errorMessage)
+        return ErrorUtils.isError(declarationDescriptor)
     }
 
     override fun TypeConstructorMarker.getApproximatedIntegerLiteralType(): KotlinTypeMarker {