[PATCH] D151125: [WebAssembly] Undef invalid DBG_VALUEs after RegColoring

[Heejin Ahn via Phabricator via llvm-commits]

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After register coalescing, some `DBG_VALUE`s can have incorrect info.
For example, if a `DBG_VALUE` has a register operand `%0`, but it
resides in a live range of `%1`, it has incorrect info after `%0` and
`%1` are coalesced. See the comments for more details.

This does not have meaningful changes on our variable debug info
coverage or compilation time, which is a good news.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D151125

Files:
  llvm/lib/Target/WebAssembly/WebAssemblyRegColoring.cpp
  llvm/test/DebugInfo/WebAssembly/dbg-value-reg-coloring.mir

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