Add the beginnings of an update API for preserving MemorySSA

Description

Add the beginnings of an update API for preserving MemorySSA

Summary:
This adds the beginning of an update API to preserve MemorySSA. In particular,
this patch adds a way to remove memory SSA accesses when instructions are
deleted.

It also adds relevant unit testing infrastructure for MemorySSA's API.

(There is an actual user of this API, i will make that diff dependent on this one. In practice, a ton of opt passes remove memory instructions, so it's hopefully an obviously useful API :P)

Reviewers: hfinkel, reames, george.burgess.iv

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D17157

Details

Committed
dannybMar 1 2016, 10:46 AM
Differential Revision
D17157: Add the beginnings of an update API for preserving MemorySSA
Parents
rL262361: [DebugInfo] Dump CIE augmentation data as a list of hex bytes
Branches
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