RFR: 8299308: Add Assembler::testw register + immediate function for x86

Fri Dec 23 10:08:29 UTC 2022

The testw register + immediate instruction is missing in the x86 assembler. It's used by generational ZGC. Let's add it.

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Commit messages:
 - 8299308: Add Assembler::testw register + immediate function for x86

Changes: https://git.openjdk.org/jdk/pull/11772/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11772&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299308
  Stats: 15 lines in 2 files changed: 15 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/11772.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11772/head:pull/11772

PR: https://git.openjdk.org/jdk/pull/11772