[PPC][LLVM] Inclusive terms: remove references to sanity check in lib/Target/PowerPC

[ZarkoCA]

Summary

Removed references to sanity check in PPCBranchCoalescing.cpp code comments.
No word substitution made in this case, as the comments and code following illustrated are
sufficient IMO.

[quinnp]

LGTM

llvm/lib/Target/PowerPC/PPCBranchCoalescing.cpp

bool PPCBranchCoalescing::canCoalesceBranch(CoalescingCandidateInfo &Cand) {
   }
 
   // Ensure there are only two successors
   if (Cand.BranchBlock->succ_size() != 2) {
     LLVM_DEBUG(dbgs() << "Does not have 2 successors - skip\n");
     return false;
   }
 
-  // Sanity check - the block must be able to fall through
+  // The block must be able to fall through.
   assert(Cand.BranchBlock->canFallThrough() &&
          "Expecting the block to fall through!");
 
   // We have already ensured there are exactly two successors to
   // BranchBlock and that BranchTargetBlock is a successor to BranchBlock.
   // Ensure the single fall though block is empty.
   MachineBasicBlock *Succ =
     (*Cand.BranchBlock->succ_begin() == Cand.BranchTargetBlock)
do {
       // If unable to coalesce the branch, then continue to next block
       if (!canCoalesceBranch(Cand1))
         break;
 
       Cand2.BranchBlock = Cand1.BranchTargetBlock;
       if (!canCoalesceBranch(Cand2))
         break;
 
-      // Sanity check
       // The branch-taken block of the second candidate should post-dominate the
-      // first candidate
+      // first candidate.
       assert(MPDT->dominates(Cand2.BranchTargetBlock, Cand1.BranchBlock) &&
              "Branch-taken block should post-dominate first candidate");
 
       if (!identicalOperands(Cand1.Cond, Cand2.Cond)) {
         LLVM_DEBUG(dbgs() << "Blocks " << Cand1.BranchBlock->getNumber()
                           << " and " << Cand2.BranchBlock->getNumber()
                           << " have different branches\n");
         break;