RFR: 8283103: compiler/vectorapi/TestMaskedMacroLogicVector.java failed due to incorrect os.simpleArch on some platforms

[Ao Qi]

`os.simpleArch` is not set correctly on some platforms, for example on loongarch64 and mips64 ([CODETOOLS-7903120](https://bugs.openjdk.java.net/browse/CODETOOLS-7903120)). This issue aims to let the test work on these platforms.

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Commit messages:
 - 8283103: compiler/vectorapi/TestMaskedMacroLogicVector.java failed due to incorrect os.simpleArch on some platforms

Changes: https://git.openjdk.java.net/jdk/pull/7809/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7809&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8283103
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7809.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7809/head:pull/7809

PR: https://git.openjdk.java.net/jdk/pull/7809