This attribute somehow remained nameless in the attribute tablegen, until now.

llvm-svn: 196415
diff --git a/clang/lib/Sema/TargetAttributesSema.cpp b/clang/lib/Sema/TargetAttributesSema.cpp
index 45067de..375e39c 100644
--- a/clang/lib/Sema/TargetAttributesSema.cpp
+++ b/clang/lib/Sema/TargetAttributesSema.cpp
@@ -267,8 +267,7 @@
         }
       }
       if (Triple.getArch() != llvm::Triple::x86_64 &&
-          (Attr.getName()->getName() == "force_align_arg_pointer" ||
-           Attr.getName()->getName() == "__force_align_arg_pointer__")) {
+          Attr.getKind() == AttributeList::AT_X86ForceAlignArgPointer) {
         HandleX86ForceAlignArgPointerAttr(D, Attr, S);
         return true;
       }