Add support for a union type in LLVM IR.  Patch by Talin!

llvm-svn: 96011
diff --git a/llvm/lib/AsmParser/LLLexer.cpp b/llvm/lib/AsmParser/LLLexer.cpp
index 8ad658d..46f3cbc 100644
--- a/llvm/lib/AsmParser/LLLexer.cpp
+++ b/llvm/lib/AsmParser/LLLexer.cpp
@@ -570,6 +570,7 @@
 
   KEYWORD(type);
   KEYWORD(opaque);
+  KEYWORD(union);
 
   KEYWORD(eq); KEYWORD(ne); KEYWORD(slt); KEYWORD(sgt); KEYWORD(sle);
   KEYWORD(sge); KEYWORD(ult); KEYWORD(ugt); KEYWORD(ule); KEYWORD(uge);