[clang] [llvm] [CoroSplit] Directly use live SSA values instead of reloading from frame (PR #218309)

[Chuanqi Xu via llvm-commits]

https://github.com/ChuanqiXu9 commented:

The high level idea sounds good. But I feel it will be better to rewrite the ramp function only instead inserting before the splitting? And of course it will be best if we can avoid these unnecessary writing for ramp function completely.

https://github.com/llvm/llvm-project/pull/218309