RFR: 8292443: Weak CAS VarHandle/Unsafe tests should test always-failing cases

[Aleksey Shipilev]

On Tue, 16 Aug 2022 15:06:50 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> I noticed that current VarHandle/Unsafe test cases do not test the always-failing cases. Strong CASes do test both always-success and always-failing scenarios, while weak CASes only test spurious-failure tests. We should be also testing always-failing cases for these. Weak CAS can spuriously fail, but it cannot spuriously succeed.
> 
> The PR looks large, but the actual changes are in `*.template` files, and the rest is generated from them.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `java/lang/invoke/VarHandles` and `compiler/unsafe` tests
>  - [x]  Linux x86_32 fastdebug `java/lang/invoke/VarHandles` and `compiler/unsafe` tests
>  - [ ]  Linux AArch64 fastdebug `java/lang/invoke/VarHandles` and `compiler/unsafe` tests

Still testing aarch64, but I expect it to complete fine. If there are no other comments, I'll integrate this soon.

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PR: https://git.openjdk.org/jdk/pull/9892