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

[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.

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Commit messages:
 - update copyright year
 - 7903120: os.simpleArch is x64 for linux-loongarch64/mips64/mips64el in @require context

Changes: https://git.openjdk.java.net/jtreg/pull/64/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jtreg&pr=64&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7903120
  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 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