[OpenCL] Refine OpenCLImageAccessAttr to OpenCLAccessAttr

Summary:
OpenCL access qualifiers are now not only used for image types, refine it to avoid misleading,

Add semacheck for OpenCL access qualifier as well as test caees.

Reviewers: pekka.jaaskelainen, Anastasia, aaron.ballman

Subscribers: aaron.ballman, cfe-commits

Differential Revision: http://reviews.llvm.org/D16040

llvm-svn: 261961
diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index 14b1128..ab6f3cc 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -4989,7 +4989,8 @@
   tok::TokenKind Kind = Tok.getKind();
 
   if (D.getDeclSpec().isTypeSpecPipe() && !isPipeDeclerator(D)) {
-    DeclSpec &DS = D.getMutableDeclSpec();
+    DeclSpec DS(AttrFactory);
+    ParseTypeQualifierListOpt(DS);
 
     D.AddTypeInfo(
         DeclaratorChunk::getPipe(DS.getTypeQualifiers(), DS.getPipeLoc()),