git: openjdk/jdk21u: master: 8357105: C2: compilation fails with "assert(false) failed: empty program detected during loop optimization"

[Goetz Lindenmaier]

Changeset: e62f2f4f
Branch: master
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2025-06-09 12:56:14 +0000
URL:       https://git.openjdk.org/jdk21u/commit/e62f2f4f0f579f6ee6d1db06683250ae990be166

8357105: C2: compilation fails with "assert(false) failed: empty program detected during loop optimization"

Backport-of: a300c356555019a42c19bf0c16184f6dee4ad96e

! src/hotspot/share/opto/stringopts.cpp
+ test/hotspot/jtreg/compiler/stringopts/TestStackedConcatsAppendUncommonTrap.java