Reverting changes from r196415; this patch exposed a different, but unrelated bug regarding the __has_attribute implementation. Reverting to unblock the Chrome tsan builds.

llvm-svn: 196583

clang/include/clang/Basic/Attr.td

@@ -920,10 +920,7 @@ def WeakRef : InheritableAttr {
 }
 
 def X86ForceAlignArgPointer : InheritableAttr, TargetSpecificAttr {
-  let Spellings = [GNU<"force_align_arg_pointer">];
-  // Technically, this appertains to a FunctionDecl, but the target-specific
-  // code silently allows anything function-like (such as typedefs or function
-  // pointers), but does not apply the attribute to them.
+  let Spellings = [];
 }
 
 // Attribute to disable AddressSanitizer (or equivalent) checks.

clang/lib/Sema/TargetAttributesSema.cpp

@@ -233,7 +233,8 @@ namespace {
         }
       }
       if (Triple.getArch() != llvm::Triple::x86_64 &&
-          Attr.getKind() == AttributeList::AT_X86ForceAlignArgPointer) {
+          (Attr.getName()->getName() == "force_align_arg_pointer" ||
+           Attr.getName()->getName() == "__force_align_arg_pointer__")) {
         HandleX86ForceAlignArgPointerAttr(D, Attr, S);
         return true;
       }