tree 392e9597d5ebc8f45e3017fb607f5eb1857e907e
parent 9c9345cd728db7b9c2b1dbbba29954bd37922f68
author Matt Arsenault <Matthew.Arsenault@amd.com> 1546989047 +0000
committer Matt Arsenault <Matthew.Arsenault@amd.com> 1546989047 +0000

RegisterCoalescer: Defer clearing implicit_def lanes

We can't go back and recover the lanes if it turns
out the implicit_def really can't be erased.

Assume all lanes are valid if an unresolved conflict
is encountered. There aren't any tests where this
seems to matter either way, but this seems like a
safer option.

Fixes bug 39602

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350676 91177308-0d34-0410-b5e6-96231b3b80d8