[lworld] RFR: 8371731: [lworld] save_live_registers called with wrong arg type

[David Simms]

Use default save fpu regs

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Commit messages:
 - 8371731: [lworld] save_live_registers called with wrong arg type

Changes: https://git.openjdk.org/valhalla/pull/1733/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1733&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8371731
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/1733.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1733/head:pull/1733

PR: https://git.openjdk.org/valhalla/pull/1733