[jdk25u] RFR: 8360783: CTW: Skip deoptimization between tiers

[Aleksey Shipilev]

Massively improves CTW performance. 

Additional testing:
 - [x] Linux x86_64 server fastdebug, `applications/ctw/modules` performance improves like in mainline
 - [x] Linux x86_64 server fastdebug, `applications/ctw/modules`

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

Commit messages:
 - Backport cd6caedd0a3c9ebd4c8c57e64f62b60161c5cd7c

Changes: https://git.openjdk.org/jdk25u/pull/90/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=90&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8360783
  Stats: 8 lines in 1 file changed: 6 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk25u/pull/90.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/90/head:pull/90

PR: https://git.openjdk.org/jdk25u/pull/90