[PATCH] D58591: [WebAssembly] Remove unnecessary instructions after TRY marker placement

[Heejin Ahn via Phabricator via llvm-commits]

aheejin created this revision.
aheejin added a reviewer: dschuff.
Herald added subscribers: llvm-commits, sunfish, jgravelle-google, sbc100.
Herald added a project: LLVM.

This removes unnecessary instructions after TRY marker placement. There
are two cases:

- `end`/`end_block` can be removed if they overlap with `try`/`end_try` and they have the same return types.
- `br` right before `catch` that branches to after `end_try` can be deleted.


Repository:
  rL LLVM

https://reviews.llvm.org/D58591

Files:
  lib/Target/WebAssembly/WebAssemblyCFGStackify.cpp
  test/CodeGen/WebAssembly/cfg-stackify-eh.ll
  test/CodeGen/WebAssembly/exception.ll

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