RFR (M) 8155739: [TESTBUG] VarHandles/Unsafe tests for weakCAS should allow spurious failures

[Aleksey Shipilev]

Hi,

I would like to fix a simple testbug in our weakCompareAndSet VarHandles
and Unsafe intrinsics tests. weakCompareAndSet is spec-ed to allow
spurious failures, but current tests do not allow that. This blocks
development and testing on non-x86 platforms.

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8155739

Webrevs:
  http://cr.openjdk.java.net/~shade/8155739/webrev.hs.00/
  http://cr.openjdk.java.net/~shade/8155739/webrev.jdk.00/

The tests are auto-generated, and the substantiative changes are in
*.template files. I also removed obsolete generate-unsafe-tests.sh. I
would like to push through hs-comp to expose this to Power and AArch64
folks early.

Testing: x86_64, jdk:java/lang/invoke/VarHandle, hotspot:compiler/unsafe

Thanks,
-Aleksey

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