[Diagnostic] Always resolve types required for raw representative construction

Since both raw representable and value types originated in
constraint system they can have type variables which need to be
resolved before types could be used in a diagnostic and fix-it.

Author: xedin

lib/Sema/CSDiagnostics.h

@@ -2123,8 +2123,9 @@ class MissingRawRepresentativeInitFailure final : public FailureDiagnostic {
   MissingRawRepresentativeInitFailure(const Solution &solution,
                                       Type rawReprType, Type valueType,
                                       ConstraintLocator *locator)
-      : FailureDiagnostic(solution, locator), RawReprType(rawReprType),
-        ValueType(valueType) {}
+      : FailureDiagnostic(solution, locator),
+        RawReprType(resolveType(rawReprType)),
+        ValueType(resolveType(valueType)) {}
 
   bool diagnoseAsError() override;
 };