Implement stack protectors as function attributes: "ssp" and "sspreq".

llvm-svn: 59202
diff --git a/llvm/lib/AsmParser/LLLexer.cpp b/llvm/lib/AsmParser/LLLexer.cpp
index 39d62bf..20b2b88 100644
--- a/llvm/lib/AsmParser/LLLexer.cpp
+++ b/llvm/lib/AsmParser/LLLexer.cpp
@@ -499,6 +499,8 @@
   KEYWORD("noinline", NOINLINE);
   KEYWORD("alwaysinline", ALWAYSINLINE);
   KEYWORD("optsize", OPTSIZE);
+  KEYWORD("ssp", SSP);
+  KEYWORD("sspreq", SSPREQ);
 
   KEYWORD("type", TYPE);
   KEYWORD("opaque", OPAQUE);