Recognize 0X and 0B as a valid radix characters.

[sidneym]

Summary

llvm-mc doesn't recognize the upper case equivalents of 0x# and 0b#.

[colinl]

LGTM

lib/MC/MCParser/AsmLexer.cpp

     return intToken(Result, Value);
   }
 
-  if (*CurPtr == 'b') {
+  if ((*CurPtr == 'b') || (*CurPtr == 'B')) {
     ++CurPtr;
     // See if we actually have "0b" as part of something like "jmp 0b\n"
     if (!isdigit(CurPtr[0])) {

     return intToken(Result, Value);
   }
 
-  if (*CurPtr == 'x') {
+  if ((*CurPtr == 'x') || (*CurPtr == 'X')) {
     ++CurPtr;
     const char *NumStart = CurPtr;
     while (isxdigit(CurPtr[0]))

lib/Support/StringRef.cpp

 }
 
 static unsigned GetAutoSenseRadix(StringRef &Str) {
-  if (Str.startswith("0x")) {
+  if (Str.startswith("0x") || Str.startswith("0X")) {
     Str = Str.substr(2);
     return 16;
   }
   
-  if (Str.startswith("0b")) {
+  if (Str.startswith("0b") || Str.startswith("0B")) {
     Str = Str.substr(2);
     return 2;
   }

test/MC/AsmParser/uppercase-hex.s

+# RUN: llvm-mc -triple i386-unknown-unknown %s | FileCheck %s
+
+foo:
+.short  0X1
+# CHECK: .short 1
+.short  0B1
+# CHECK: .short 1