[jdk17u-dev] RFR: 8280593: [PPC64, S390] redundant allocation of MacroAssembler in StubGenerator ctor

[Richard Reingruber]

Hi all,

This pull request contains a backport of commit [c936e705](https://github.com/openjdk/jdk/commit/c936e7059b848d0e0be5f3234c4367657f2af2a7) from the [openjdk/jdk](https://git.openjdk.java.net/jdk) repository.

The commit being backported was authored by Richard Reingruber on 4 Feb 2022 and was reviewed by Martin Doerr and Lutz Schmidt.

Thanks!
Richard.

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Commit messages:
 - Backport c936e7059b848d0e0be5f3234c4367657f2af2a7

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/376/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=376&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280593
  Stats: 10 lines in 3 files changed: 0 ins; 5 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/376.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/376/head:pull/376

PR: https://git.openjdk.java.net/jdk17u-dev/pull/376