tree 9043921d5901f6641ddc5c47c81f4079996c2a90
parent 07791684dc6f8e042e48b2a6db90113385bb5d3d
author Cherry Zhang <cherryyz@google.com> 1547135619 -0500
committer Cherry Zhang <cherryyz@google.com> 1547493333 +0000

passes: delete lifetime markers on Phis involving ambiguously live slots

If a Phi (presumably holding an alloca) has lifetime markers and
it gets assigned the same stack slot as an alloca, it could
shorten the lifetime of the slot unwantedly, causing the slot
being reused while still recorded as live. Prevent this from
happening by removing the lifetime markers on Phis containing
ambigously live allocas.

Change-Id: Ia326ba82b6225f18ea3cc7b8652066e53abe7cc4
Reviewed-on: https://go-review.googlesource.com/c/157558
Reviewed-by: Than McIntosh <thanm@google.com>