RFR (XS) 8212005: Epsilon elastic TLAB sizing may cause misalignment

[Roman Kennke]

Looks sensible!

Thanks,
Roman


> Bug:
>   https://bugs.openjdk.java.net/browse/JDK-8212005
> 
> I thought we handle it properly, but we are not. This causes tier1_gc failures in x86_32 now.
> 
> Fix:
>   http://cr.openjdk.java.net/~shade/8212005/webrev.01/
> 
> Testing: Linux {x86_64, x86_32} gc/epsilon, jdk-submit (running)
> 
> Thanks,
> -Aleksey
> 

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