[ClangImporter] Skip importing values for CGFloat typedefs on top of CGFloats direct

lib/ClangImporter/SwiftDeclSynthesizer.cpp

@@ -197,6 +197,16 @@ Type SwiftDeclSynthesizer::getConstantLiteralType(
   }
 }
 
+bool SwiftDeclSynthesizer::isCGFloat(Type type) {
+  auto found = ImporterImpl.RawTypes.find(type->getAnyNominal());
+  if (found == ImporterImpl.RawTypes.end()) {
+    return false;
+  }
+  
+  Type importTy = found->second;
+  return importTy->isCGFloat();
+}
+
 ValueDecl *SwiftDeclSynthesizer::createConstant(Identifier name,
                                                 DeclContext *dc, Type type,
                                                 const clang::APValue &value,