git: openjdk/jdk21u-dev: master: 8337660: C2: basic blocks with only BoxLock nodes are wrongly treated as empty

[Goetz Lindenmaier]

Changeset: 056a2651
Branch: master
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2025-01-03 10:27:20 +0000
URL:       https://git.openjdk.org/jdk21u-dev/commit/056a2651af9e27d6d80ae01265acfecc8953b224

8337660: C2: basic blocks with only BoxLock nodes are wrongly treated as empty

Reviewed-by: mbaesken
Backport-of: 0105203575182e24a56a38a12da7c1af58ea0a78

! src/hotspot/share/opto/block.cpp
+ test/hotspot/jtreg/compiler/locks/TestSynchronizeWithEmptyBlock.java