[ClangImporter] Handle DefaultArgument now being a TemplateArgmentLoc

This was changed in upstream LLVM 142c3f394e1b34dcefcaf0887a6fd4711b78eeb3.

Author: bnbarham

lib/AST/ClangTypeConverter.cpp

@@ -895,8 +895,8 @@ ClangTypeConverter::getClangTemplateArguments(
     auto templateParam = cast<clang::TemplateTypeParmDecl>(param);
     // We must have found a defaulted parameter at the end of the list.
     if (templateParam->getIndex() >= genericArgs.size()) {
-      templateArgs.push_back(
-          clang::TemplateArgument(templateParam->getDefaultArgument()));
+      templateArgs.push_back(clang::TemplateArgument(
+          templateParam->getDefaultArgument().getArgument()));
       continue;
     }
 

lib/ClangImporter/ImportDecl.cpp

@@ -3457,8 +3457,9 @@ namespace {
             // parameters when the function template is instantiated, so do not
             // import the function template if the template parameter has
             // dependent default value.
-            auto defaultArgumentType = templateTypeParam->getDefaultArgument();
-            if (defaultArgumentType->isDependentType())
+            auto &defaultArgument =
+                templateTypeParam->getDefaultArgument().getArgument();
+            if (defaultArgument.isDependent())
               return nullptr;
             continue;
           }