tree d7390d83a68045c61d7f3bc950cef8f398ee3993
parent 2b74f60158fe85192c4f9b8810fe3cdffabe4198
author Alex Light <allight@google.com> 1585953750 -0700
committer Treehugger Robot <treehugger-gerrit@google.com> 1592417252 +0000

Make GVN handle HDeoptimize better

The GVN system didn't handle the deoptimization very well since
deoptimize is a predicated operation. This means that HDeoptimize
needs to prevent some code motion but if it isn't taken the operation
has no effect. This confused the GVN system into thinking that it
cannot merge deoptimizations. To fix this we special cased the side
effects GVN considers deoptimizations to have.

Test: ./test.py --host
Change-Id: Ic79d975f9ae584a07026647cee2768ed1105e5a9