[jdk17u] RFR: 8268963: [IR Framework] Some default regexes matching on PrintOptoAssembly in IRNode.java do not work on all platforms

[Tobias Hartmann]

Backport of [JDK-8268963](https://bugs.openjdk.java.net/browse/JDK-8268963). Applies cleanly.

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Commit messages:
 - 8268963: [IR Framework] Some default regexes matching on PrintOptoAssembly in IRNode.java do not work on all platforms

Changes: https://git.openjdk.java.net/jdk17u/pull/18/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=18&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268963
  Stats: 331 lines in 7 files changed: 193 ins; 26 del; 112 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/18.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/18/head:pull/18

PR: https://git.openjdk.java.net/jdk17u/pull/18