[c++2a] [concepts] Add rudimentary parsing support for template concept declarations

This patch is a tweak of changyu's patch: https://reviews.llvm.org/D40381. It differs in that the recognition of the 'concept' token is moved into the machinery that recognizes declaration-specifiers - this allows us to leverage the attribute handling machinery more seamlessly.

See the test file to get a sense of the basic parsing that this patch supports. 

There is much more work to be done before concepts are usable...

Thanks Changyu!

llvm-svn: 330794

1 files changed, 1 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGDecl.cpp b/clang/lib/CodeGen/CGDecl.cpp
index c9b80e38d4b..38eb0c8fe78 100644
--- a/clang/lib/CodeGen/CGDecl.cpp
+++ b/clang/lib/CodeGen/CGDecl.cpp
@@ -105,6 +105,7 @@ void CodeGenFunction::EmitDecl(const Decl &D) {
   case Decl::OMPThreadPrivate:
   case Decl::OMPCapturedExpr:
   case Decl::Empty:
+  case Decl::Concept:
     // None of these decls require codegen support.
     return;