RFR: 8370378: Some compiler tests inadvertently exclude particular platforms [v2]

[Tobias Hartmann]

> As @dholmes-ora described in JBS: For historical reasons `os.arch` is `amd64` on x86_64 Linux and Windows, but `x86_64` on macOS. I fixed the tests accordingly.
> 
> Thanks,
> Tobias

Tobias Hartmann has updated the pull request incrementally with four additional commits since the last revision:

 - Update TestBit.java
 - Update test/hotspot/jtreg/compiler/c2/TestBit.java
   
   Co-authored-by: Christian Hagedorn <christian.hagedorn at oracle.com>
 - Update test/hotspot/jtreg/compiler/c2/irTests/RotateLeftNodeLongIdealizationTests.java
   
   Co-authored-by: Christian Hagedorn <christian.hagedorn at oracle.com>
 - Update test/hotspot/jtreg/compiler/c2/irTests/RotateLeftNodeIntIdealizationTests.java
   
   Co-authored-by: Christian Hagedorn <christian.hagedorn at oracle.com>

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27931/files
  - new: https://git.openjdk.org/jdk/pull/27931/files/fc92ee6e..39fcc6bc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27931&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27931&range=00-01

  Stats: 3 lines in 3 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/27931.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27931/head:pull/27931

PR: https://git.openjdk.org/jdk/pull/27931