Tidy up several unbeseeming casts from pointer to intptr_t.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55779 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/IPO/ConstantMerge.cpp

@@ -31,7 +31,7 @@ STATISTIC(NumMerged, "Number of global constants merged");
 namespace {
   struct VISIBILITY_HIDDEN ConstantMerge : public ModulePass {
     static char ID; // Pass identification, replacement for typeid
-    ConstantMerge() : ModulePass((intptr_t)&ID) {}
+    ConstantMerge() : ModulePass(&ID) {}
 
     // run - For this pass, process all of the globals in the module,
     // eliminating duplicate constants.