RFR: 7903138: os.simpleArch is x64 for linux-riscv64 in @require context [v4]

[Feilong Jiang]

> RISC-V Port has been integrated into JDK mainline recently ([JDK-8276799](https://bugs.openjdk.java.net/browse/JDK-8276799)). Set simpleArch to riscv64 when os.arch is riscv64
> 
> Tested on  Linux riscv64. With the patch, [test/hotspot/jtreg/compiler/vectorapi/TestMaskedMacroLogicVector.java](https://github.com/openjdk/jdk/blob/jdk-19%2B13/test/hotspot/jtreg/compiler/vectorapi/TestMaskedMacroLogicVector.java) was successfully skipped.

Feilong Jiang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains four commits:

 - Merge branch 'master' of https://github.com/openjdk/jtreg into riscv64-simplearch
 - remove riscv in comment
 - update comments
 - os.simpleArch is x64 for linux-riscv64 in @require context

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Changes: https://git.openjdk.java.net/jtreg/pull/66/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jtreg&pr=66&range=03
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jtreg/pull/66.diff
  Fetch: git fetch https://git.openjdk.java.net/jtreg pull/66/head:pull/66

PR: https://git.openjdk.java.net/jtreg/pull/66