[jdk18] RFR: 8280234: AArch64 "core" variant does not build after JDK-8270947

[Aleksey Shipilev]

Trivial (?) fix for AArch64 build failure:


=== Output from failing command(s) repeated here ===
* For target hotspot_variant-core_libjvm_objs_macroAssembler_aarch64.o:

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Commit messages:
 - Fix

Changes: https://git.openjdk.java.net/jdk18/pull/108/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk18&pr=108&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280234
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk18/pull/108.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18 pull/108/head:pull/108

PR: https://git.openjdk.java.net/jdk18/pull/108