RFR: 8291899: Zero VM is broken on MacOS after JDK-8290840 due to os::setup_fpu() is missing

[Jie Fu]

Hi all,

Zero VM fails to build on MacOS after JDK-8290840 due to `os::setup_fpu()` is missing.
The fix just adds the definition of it for macos.

Thanks.
Best regards,
Jie

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Commit messages:
 - 8291899: Zero VM is broken on MacOS after JDK-8290840 due to os::setup_fpu() is missing

Changes: https://git.openjdk.org/jdk/pull/9744/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9744&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8291899
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/9744.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9744/head:pull/9744

PR: https://git.openjdk.org/jdk/pull/9744