RFR: 8293939: Move continuation_enter_setup and friends

Wed Oct 19 16:13:50 UTC 2022

Please review this trivial change. I moved these functions to sharedRuntime_<cpu>.cpp just before they are used.
Tested with tier1 on x86 and aarch64, and locally test/hotspot/jtreg:hotspot_loom.

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Commit messages:
 - 8293939: Move continuation_enter_setup and friends

Changes: https://git.openjdk.org/jdk/pull/10770/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10770&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293939
  Stats: 368 lines in 5 files changed: 155 ins; 202 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/10770.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10770/head:pull/10770

PR: https://git.openjdk.org/jdk/pull/10770