t/clang/type-traits

Patch authored by John Wiegley.

These type traits are used for parsing code that employs certain features of
the Embarcadero C++ compiler.  Several of these constructs are also desired by
libc++, according to its project pages (such as __is_standard_layout).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@130342 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/DeclCXX.cpp b/lib/AST/DeclCXX.cpp
index a71750b..7ab6030 100644
--- a/lib/AST/DeclCXX.cpp
+++ b/lib/AST/DeclCXX.cpp
@@ -926,6 +926,10 @@
 
 void CXXRecordDecl::completeDefinition() {
   completeDefinition(0);
+
+  ASTContext &Context = getASTContext();
+  if (const RecordType *RT = getTypeForDecl()->getAs<RecordType>())
+    data().HasStandardLayout = RT->hasStandardLayout(Context);
 }
 
 void CXXRecordDecl::completeDefinition(CXXFinalOverriderMap *FinalOverriders) {