RFR: 7903120: os.simpleArch is x64 for linux-loongarch64/mips64/mips64el in @require context [v2]

[Ao Qi]

> Also set simpleArch to mips64, when os.arch is mips64el.
> 
> Tested on loongarch64 and mips64. After 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 on loongarch64 and mips64.

Ao Qi has updated the pull request incrementally with one additional commit since the last revision:

  useless code

-------------

Changes:
  - all: https://git.openjdk.java.net/jtreg/pull/64/files
  - new: https://git.openjdk.java.net/jtreg/pull/64/files/185f1e3c..a4dbfbc0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jtreg&pr=64&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jtreg&pr=64&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/jtreg/pull/64.diff
  Fetch: git fetch https://git.openjdk.java.net/jtreg pull/64/head:pull/64

PR: https://git.openjdk.java.net/jtreg/pull/64