RFR: 8214257: IC cache not clean after cleaning assertion failure

[Vladimir Kozlov]

Looks good to me.

Thanks,
Vladimir

On 11/27/18 5:00 AM, Erik Österlund wrote:
> Hi,
> 
> Back in 8212681, an abstract CompiledICLocker was introduce to protect inline caches from concurrent patching.
> 
> Unfortunately, not all patching of ICs started using the CompiledICLocker. There were still some callsites using the 
> Patching_lock. Therefore, the assert may trigger sometimes saying the IC cache is not clean right after cleaning, due to 
> other concurrent modifications under the Patching_lock.
> 
> Also, in CompiledIC::set_to_clean(), the condition for safe_transition was altered incorrectly from is_at_safepoint() to 
> CompiledICLocker::is_safe(), causing cleaning to not used transition, so I reinstated that in this patch.
> 
> This patch depends on 8214338 by assuming that the CompiledICLocker does not use safepoint checks, as it is now used 
> from leaf calls where safepointing is not allowed.
> 
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8214257
> 
> Webrev:
> http://cr.openjdk.java.net/~eosterlund/8214257/webrev.00/
> 
> Thanks,
> /Erik