RFR: 8254661: arm32: additional cleanup after fixing SIGSEGV

[Aleksey Shipilev]

On Wed, 11 Nov 2020 10:02:46 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> This change fixes the fastdebug build assertion. This is actually a missing change for [8253901: ARM32: SIGSEGV during monitorexit](https://github.com/openjdk/jdk/pull/503)
>
> Thanks, looks fine to me. I was a bit concerned that `InterpreterRuntime::monitorExit` might carry some result in `R0`, but it seems to return `void`, so that looks fine.

Note that bots would not allow to integrate until PR title and JBS synopsis match.

-------------

PR: https://git.openjdk.java.net/jdk/pull/1157