make the lexer unique strings it lexes instead of passing them back as
std::strings.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74036 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-mc/AsmParser.cpp b/tools/llvm-mc/AsmParser.cpp
index c9d2071..4dd136d 100644
--- a/tools/llvm-mc/AsmParser.cpp
+++ b/tools/llvm-mc/AsmParser.cpp
@@ -179,7 +179,7 @@
   
   // If we have an identifier, handle it as the key symbol.
   SMLoc IDLoc = Lexer.getLoc();
-  std::string IDVal = Lexer.getCurStrVal();
+  const char *IDVal = Lexer.getCurStrVal();
   
   // Consume the identifier, see what is after it.
   if (Lexer.Lex() == asmtok::Colon) {