git: openjdk/mobile: 8229694: JVM crash in SWPointer during C2 OSR compilation

[duke]

Changeset: 173dae8b
Author:    Christian Hagedorn <chagedorn at openjdk.org>
Date:      2019-11-11 10:41:03 +0000
URL:       https://git.openjdk.java.net/mobile/commit/173dae8b

8229694: JVM crash in SWPointer during C2 OSR compilation

Handle the case where there is only 1 pack and no operations left when calling SuperWord::find_align_to_ref() to find the best alignment again.

Reviewed-by: kvn, vlivanov, thartmann

! src/hotspot/share/opto/superword.cpp
+ test/hotspot/jtreg/compiler/loopopts/superword/AlignmentOnePack.java