[jdk21u-dev] RFR: 8319973: AArch64: Save and restore FPCR in the call stub

[Boris Ulasevich]

Backporting this change is important to ensure correct FPCR handling and to avoid unexpected behavior. Applying it to earlier releases will ensure stability and consistency across all versions. As a next step, I will propose a backport for JDK-8320892, which depends on this change.

[JDK-8319973](https://bugs.openjdk.org/browse/JDK-8319973): AArch64: Save and restore FPCR in the call stub 
[JDK-8320892](https://bugs.openjdk.org/browse/JDK-8320892): AArch64: Restore FPU control state after JNI

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Commit messages:
 - Backport 6e86904a94d2ed2815aa6e3364c048dac595320d

Changes: https://git.openjdk.org/jdk21u-dev/pull/1042/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1042&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319973
  Stats: 34 lines in 4 files changed: 28 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1042.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1042/head:pull/1042

PR: https://git.openjdk.org/jdk21u-dev/pull/1042