Add new function attribute - noredzone. 
Update code generator to use this attribute and remove DisableRedZone target option.
Update llc to set this attribute when -disable-red-zone command line option is used.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72894 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AsmParser/LLLexer.cpp b/lib/AsmParser/LLLexer.cpp
index f2e6890..340cfe1 100644
--- a/lib/AsmParser/LLLexer.cpp
+++ b/lib/AsmParser/LLLexer.cpp
@@ -547,6 +547,7 @@
   KEYWORD(optsize);
   KEYWORD(ssp);
   KEYWORD(sspreq);
+  KEYWORD(noredzone);
 
   KEYWORD(type);
   KEYWORD(opaque);