ARM32: SIGSEGV during monitorexit due to incorrect register use (after JDK-8253540)

JDK-8253540 changed InterpreterRuntime::monitorexit to be be a JRT_LEAF function.
For ARM32 the change crashes immediatelly on startup:

$ jdk-16/bin/java -version

#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00000000, pid=21691, tid=21692
#
# JRE version: (16.0) (build )
# Java VM: OpenJDK Server VM (16-BellSoft+0-adhoc.boris.jdk, mixed mode, g1 gc, linux-arm)
# Problematic frame:
# C 0x00000000

hs_err log attached.