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.cpp b/lib/MC/MCDisassembler/EDToken.cpp
index edbe0e0..5f6c9df 100644
--- a/lib/MC/MCDisassembler/EDToken.cpp
+++ b/lib/MC/MCDisassembler/EDToken.cpp
@@ -87,7 +87,7 @@
 
 int EDToken::tokenize(std::vector<EDToken*> &tokens,
                       std::string &str,
-                      const char *operandOrder,
+                      const signed char *operandOrder,
                       EDDisassembler &disassembler) {
   SmallVector<MCParsedAsmOperand*, 5> parsedOperands;
   SmallVector<AsmToken, 10> asmTokens;