Fix C++0x narrowing errors when char is unsigned.

In the case of EDInstInfo, this would actually cause a bug when -1 became 255
and was then compared >=0 in llvm-mc/Disassembler.cpp.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138825 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCDisassembler/EDToken.h b/lib/MC/MCDisassembler/EDToken.h
index ba46707..384079b 100644
--- a/lib/MC/MCDisassembler/EDToken.h
+++ b/lib/MC/MCDisassembler/EDToken.h
@@ -125,7 +125,7 @@
   //                      assembly syntax
   static int tokenize(std::vector<EDToken*> &tokens,
                       std::string &str,
-                      const char *operandOrder,
+                      const signed char *operandOrder,
                       EDDisassembler &disassembler);
   
   /// getString - Directs a character pointer to the string, returning 0 on