RFR: 8254661: arm32: additional cleanup after fixing SIGSEGV

[Aleksey Shipilev]

On Wed, 11 Nov 2020 07:46:35 GMT, Boris Ulasevich <bulasevich 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.

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Marked as reviewed by shade (Reviewer).

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