git: openjdk/jdk17u-dev: 8291775: C2: assert(r != __null && r->is_Region()) failed: this phi must have a region

[Goetz Lindenmaier]

Changeset: 19ccadf5
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2022-10-05 06:51:13 +0000
URL:       https://git.openjdk.org/jdk17u-dev/commit/19ccadf58b74ff81333d6c89f12e25b7652f295f

8291775: C2: assert(r != __null && r->is_Region()) failed: this phi must have a region

Backport-of: 32d675ca607d341ca3428efc32e212701775e3c6

! src/hotspot/share/opto/stringopts.cpp
! test/hotspot/jtreg/compiler/c2/Test7179138_1.java