Heejin Ahn 6d33affac0 [WebAssembly] Add comments on local.tee transformation ...

We have a good comment on `TEE` transformation in `RegStackify`:
547e345666/llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp (L613-L632)

And I think it can be helpful to have some more comments on how the
`TEE`s created in `RegStackify` are converted into `LOCAL_TEE`s.

Variable `OldReg` is changed to `DefReg` to be consistent with
`RegStackify`'s comment.

Reviewed By: tlively

Differential Revision: https://reviews.llvm.org/D146084

2023-03-17 20:16:16 -07:00

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