RFR(8u-dev): JDK-8199406: Performance drop with Java JDK 1.8.0_162-b32

[Poonam Parhar]

Hello Vladimir, Coleen, Thomas,

Could I request you to take a look at the 8u changes for JDK-8199406 as 
well:

Bug: JDK-8199406 <https://bugs.openjdk.java.net/browse/JDK-8199406>: 
Performance drop with Java JDK 1.8.0_162-b32
Webrev: http://cr.openjdk.java.net/~poonam/8199406/webrev.8u/
jdk/hs changeset: http://hg.openjdk.java.net/jdk/hs/rev/d6893a76c554

The changes mostly apply cleanly from JDK 11 changeset except for the 
file path shuffling, and a few other minor changes such as calling 
round_to() instead of align_up().

Thanks,
Poonam



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