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[WebAssembly] Fix bug in FixBrTables and use branch analysis utils

Authored by tlively on Jun 17 2020, 12:34 PM.

Description

[WebAssembly] Fix bug in FixBrTables and use branch analysis utils

Summary:
This commit fixes a bug in the FixBrTables pass in which an
unconditional branch from the switch header block to the jump table
block was not removed before the blocks were combined. The result was
an invalid CFG in the MachineFunction. This commit also switches from
using bespoke branch analysis and deletion code to using the standard
utilities for the same.

Reviewers: aheejin, dschuff

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

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D81909

Details