RFR (XS) 8212177: Epsilon alignment adjustments can overflow max TLAB size

[Aleksey Shipilev]

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8212177

This was spotted by Per in review last week.

Fix:
  http://cr.openjdk.java.net/~shade/8212177/webrev.01/

Testing: Linux {x86_64, x86_32} gc/epsilon, jdk-submit (running)

Thanks,
-Aleksey

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