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
diff --git a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
index c1bc47d..8da33c5 100644
--- a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -76,7 +76,7 @@
     TargetData *TD;
     bool MustPreserveLCSSA;
   public:
-    static const int ID; // Pass identifcation, replacement for typeid
+    static const char ID; // Pass identifcation, replacement for typeid
     InstCombiner() : FunctionPass((intptr_t)&ID) {}
 
     /// AddToWorkList - Add the specified instruction to the worklist if it
@@ -361,7 +361,7 @@
     Value *EvaluateInDifferentType(Value *V, const Type *Ty, bool isSigned);
   };
 
-  const int InstCombiner::ID = 0;
+  const char InstCombiner::ID = 0;
   RegisterPass<InstCombiner> X("instcombine", "Combine redundant instructions");
 }