[jdk11u-dev] RFR: 8287425: Remove unnecessary register push for MacroAssembler::check_klass_subtype_slow_path

[Johannes Bechberger]

Removes an unnecessary register push which currently makes stack walking impossible for async-profiler.

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Commit messages:
 -  8287425: Remove unnecessary register push for MacroAssembler::check_klass_subtype_slow_path

Changes: https://git.openjdk.org/jdk11u-dev/pull/1524/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1524&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287425
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1524.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1524/head:pull/1524

PR: https://git.openjdk.org/jdk11u-dev/pull/1524