git: openjdk/jdk: 8315548: G1: Document why VM_G1CollectForAllocation::doit() may allocate without completing a GC

[Ivan Walulya]

Changeset: 5a2e151d
Author:    Ivan Walulya <iwalulya at openjdk.org>
Date:      2023-09-05 10:12:24 +0000
URL:       https://git.openjdk.org/jdk/commit/5a2e151d4839787323732232b698315bcb3a3bd6

8315548: G1: Document why VM_G1CollectForAllocation::doit() may allocate without completing a GC

Reviewed-by: tschatzl

! src/hotspot/share/gc/g1/g1VMOperations.cpp