[Review]: Sink multiple instructions per iteration in InstCombine

[Aditya Nandakumar]

Hi All

I want to make a small optimization for instcombine. While sinking instructions (with single use) to the use block, also check if any other instructions which are used in the current instruction (operands) can be sunk.

This speeds up InstCombine time in several cases as previously only one instruction would be sunk per iteration.

Please review

Thanks
Aditya
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