RFR: 8278479: RunThese test failure with +UseHeavyMonitors and +VerifyHeavyMonitors [v2]

[Coleen Phillimore]

On Tue, 5 Jul 2022 17:07:28 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> This change adds a null check before calling into Runtime1::monitorenter when -XX:+UseHeavyMonitors is set. There's a null check in the C2 and interpreter code before calling the runtime function but not C1.
>> 
>> Tested with tier1-7 (a little of 8) and built on most non-oracle platforms as well.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Improve c1 code.

Thanks Dean for the review and improvement.

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PR: https://git.openjdk.org/jdk/pull/9339