[clang] [llvm] Reland Optimize PHINode::removeIncomingValue() and PHINode::removeIncomingValueIf() to use the swapping strategy. (PR #174274)

[Mingjie Xu via cfe-commits]

https://github.com/Enna1 ready_for_review 
https://github.com/llvm/llvm-project/pull/174274
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