Cleanup redundant expression in InstCombineAndOrXor.

[etienneb]

Summary

The expression is redundant on both side of operator |.

detected by : http://reviews.llvm.org/D19451

[rnk]

lgtm

FYI David Majnemer is a good reviewer for InstCombine.

[etienneb]

thx Reid. added the appropriate reviewer.

[majnemer]

LGTM

lib/Transforms/InstCombine/InstCombineAndOrXor.cpp

static unsigned getTypeOfMaskedICmp(Value* A, Value* B, Value* C,
   bool icmp_abit = (ACst && !ACst->isZero() &&
                     ACst->getValue().isPowerOf2());
   bool icmp_bbit = (BCst && !BCst->isZero() &&
                     BCst->getValue().isPowerOf2());
   unsigned result = 0;
   if (CCst && CCst->isZero()) {
     // if C is zero, then both A and B qualify as mask
     result |= (icmp_eq ? (FoldMskICmp_Mask_AllZeroes |
-                          FoldMskICmp_Mask_AllZeroes |
                           FoldMskICmp_AMask_Mixed |
                           FoldMskICmp_BMask_Mixed)
                        : (FoldMskICmp_Mask_NotAllZeroes |
-                          FoldMskICmp_Mask_NotAllZeroes |
                           FoldMskICmp_AMask_NotMixed |
                           FoldMskICmp_BMask_NotMixed));
     if (icmp_abit)
       result |= (icmp_eq ? (FoldMskICmp_AMask_NotAllOnes |
                             FoldMskICmp_AMask_NotMixed)
                          : (FoldMskICmp_AMask_AllOnes |
                             FoldMskICmp_AMask_Mixed));
     if (icmp_bbit)