Heejin Ahn cf699b4534 [WebAssembly] Remove unnecessary instructions after TRY marker placement ...

Summary:
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.

Reviewers: dschuff

Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D58591

llvm-svn: 354939

2019-02-27 00:50:53 +00:00

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