[PATCH] D48345: [WebAssembly] Fix unwind destination mismatches in CFG stackify (WIP)

[Heejin Ahn via Phabricator via llvm-commits]

aheejin created this revision.
aheejin added reviewers: dschuff, sunfish.
Herald added subscribers: llvm-commits, chrib, jgravelle-google, sbc100.

This fixes various unwind destination mismatches that can be introduced
by placing try / end_try markers. It also deletes some unnecessary
instuctions to save code size.

Does not have a mir test case yet. Adding a test case for this patch
requires serializing `WasmEHFuncInfo`, which is populated from
`WasmEHPrepare` before instruction selection.


Repository:
  rL LLVM

https://reviews.llvm.org/D48345

Files:
  lib/Target/WebAssembly/WebAssemblyCFGStackify.cpp

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