[foreign-memaccess+abi] RFR: 8295353: Mark Register v24 as Volatile in Foreign Function & Memory C ABI Definition

[Saint Wesonga]

The C ABI defined by the Foreign Function & Memory API does not include v24 in the list of volatile floating point vector registers. As per the spec, v16-v31 do not need to be preserved. See https://github.com/ARM-software/abi-aa/blob/main/aapcs64/aapcs64.rst#612simd-and-floating-point-registers

-------------

Commit messages:
 - 8295353: Mark Register v24 as Volatile in Foreign Function & Memory C ABI Definition

Changes: https://git.openjdk.org/panama-foreign/pull/743/files
 Webrev: https://webrevs.openjdk.org/?repo=panama-foreign&pr=743&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295353
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/743.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign pull/743/head:pull/743

PR: https://git.openjdk.org/panama-foreign/pull/743