[jdk21u] RFR: 8315545: C1: x86 cmove can use short branches

[Aleksey Shipilev]

Clean backport to improve generated code density.

Additional testing:
 - [ ] Linux x86_64 fastdebug `tier1 tier2 tier3 tier4`, `-XX:TieredStopAtLevel=1`

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

Commit messages:
 - Backport 6c821f5e1ddfae26c445f0cd5fe9205f49bfddee

Changes: https://git.openjdk.org/jdk21u/pull/356/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=356&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315545
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u/pull/356.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/356/head:pull/356

PR: https://git.openjdk.org/jdk21u/pull/356