Use 'static const char' instead of 'static const int'.

Due to darwin gcc bug, one version of darwin linker coalesces
static const int, which defauts PassID based pass identification.

llvm-svn: 36652

llvm/lib/Transforms/Utils/UnifyFunctionExitNodes.cpp

@@ -22,7 +22,7 @@
 #include "llvm/Type.h"
 using namespace llvm;
 
-const int UnifyFunctionExitNodes::ID = 0;
+const char UnifyFunctionExitNodes::ID = 0;
 static RegisterPass<UnifyFunctionExitNodes>
 X("mergereturn", "Unify function exit nodes");