turn IPSCCP back on now that the iterator invalidation bug is fixed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85858 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/StandardPasses.h

@@ -99,7 +99,6 @@ namespace llvm {
     if (UnitAtATime) {
       PM->add(createGlobalOptimizerPass());     // Optimize out global vars
       
-      PM->add(createIPConstantPropagationPass());              // IP CP
       PM->add(createIPSCCPPass());              // IP SCCP
       PM->add(createDeadArgEliminationPass());  // Dead argument elimination
     }