Put all LLVM code into the llvm namespace, as per bug 109.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9903 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AsmParser/Lexer.l

@@ -35,6 +35,7 @@
 #define RET_TOK(type, Enum, sym) \
   llvmAsmlval.type = Instruction::Enum; return sym
 
+namespace llvm {
 
 // TODO: All of the static identifiers are figured out by the lexer, 
 // these should be hashed to reduce the lexer size
@@ -121,6 +122,10 @@ char *UnEscapeLexed(char *Buffer, bool AllowNull) {
   return BOut;
 }
 
+} // End llvm namespace
+
+using namespace llvm;
+
 #define YY_NEVER_INTERACTIVE 1
 %}