Parse debug info attached with an instruction.

llvm-svn: 82063
diff --git a/llvm/lib/AsmParser/LLLexer.cpp b/llvm/lib/AsmParser/LLLexer.cpp
index 23d7f19..315048c 100644
--- a/llvm/lib/AsmParser/LLLexer.cpp
+++ b/llvm/lib/AsmParser/LLLexer.cpp
@@ -530,6 +530,7 @@
   KEYWORD(asm);
   KEYWORD(sideeffect);
   KEYWORD(gc);
+  KEYWORD(dbg);
 
   KEYWORD(ccc);
   KEYWORD(fastcc);