RFR: 8296630: Fix SkipIfEqual on AArch64 and RISC-V

[Ludovic Henry]

On Thu, 10 Nov 2022 03:17:37 GMT, Yadong Wang <yadongwang at openjdk.org> wrote:

> SkipIfEqual was supposed to load a flag value from some memory, compare it with a input boolean value, and jump to a specific label they a equals. The implementation on x86 and s390 platforms meets expectations, and ppc uses SkipIfEqualZero. However, on AArch64 and RISC-V platforms, the input argument "value" is not used, and jumping-if-equal-zero is generated only. That's not correct, but works well since only false passed on all call sites so far.
> 
> AArch64 tier1, riscv hotspot & jdk tier1 have been tested.
> Additional cases with dtrace tested on AArch64:
> test/hotspot/jtreg/serviceability/dtrace/DTraceOptionsTest.java
> test/hotspot/jtreg/compiler/runtime/Test8168712.java

Marked as reviewed by luhenry (Author).

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PR: https://git.openjdk.org/jdk/pull/11076