git: openjdk/jdk20u: master: 3 new changesets

[Tobias Hartmann]

Changeset: db88ed0e
Author:    Tobias Hartmann <thartmann at openjdk.org>
Date:      2023-04-04 12:57:59 +0000
URL:       https://git.openjdk.org/jdk20u/commit/db88ed0e483ae8a685fa17c0822f49e5f1662706

8290822: C2: assert in PhaseIdealLoop::do_unroll() is subject to undefined behavior

Backport-of: cd77fcfb5f9156e5f0909fa15a842dde6c25c66a

! src/hotspot/share/opto/loopTransform.cpp

Changeset: c23e1ccc
Author:    Tobias Hartmann <thartmann at openjdk.org>
Date:      2023-04-04 12:58:56 +0000
URL:       https://git.openjdk.org/jdk20u/commit/c23e1ccce40c8c1b126ee739a7a7649433f0f95a

8301491: C2: java.lang.StringUTF16::indexOfChar intrinsic called with negative character argument

Backport-of: 47ca5773a54743244a9b28f877246d260b90a408

! src/hotspot/share/opto/library_call.cpp
+ test/hotspot/jtreg/compiler/intrinsics/string/TestStringIndexOfCharIntrinsics.java

Changeset: 9c6b17d1
Author:    Tobias Hartmann <thartmann at openjdk.org>
Date:      2023-04-04 13:00:05 +0000
URL:       https://git.openjdk.org/jdk20u/commit/9c6b17d171e923f3fa27bf2eab54ea9ac1916053

8303511: C2: assert(get_ctrl(n) == cle_out) during unrolling

Backport-of: 3f2d929dc3336b301e7e5dceb899d59451645828

! src/hotspot/share/opto/loopopts.cpp
+ test/hotspot/jtreg/compiler/loopstripmining/TestAddPAtOuterLoopHead.java