add #include


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44710 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AsmParser/LLLexer.cpp b/lib/AsmParser/LLLexer.cpp
index 5b1f074..72e19f1d 100644
--- a/lib/AsmParser/LLLexer.cpp
+++ b/lib/AsmParser/LLLexer.cpp
@@ -14,6 +14,7 @@
 #include "LLLexer.h"
 #include "ParserInternals.h"
 #include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/MathExtras.h"
 
 #include <list>
 #include "llvmAsmParser.h"