Add some semantic checks for OpenCL. Variadic macros, VLAs and bitfields are not supported.

llvm-svn: 172732
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 728a58e..a13d8b3 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -9871,6 +9871,12 @@
     }
   }
 
+  // OpenCL v1.2 s6.9.c: bitfields are not supported.
+  if (BitWidth && getLangOpts().OpenCL) {
+    Diag(Loc, diag::err_opencl_bitfields);
+    InvalidDecl = true;
+  }
+
   // C99 6.7.2.1p8: A member of a structure or union may have any type other
   // than a variably modified type.
   if (!InvalidDecl && T->isVariablyModifiedType()) {