RFR: 8218885: Restore pop_frame and force_early_return functionality for Graal

[Tom Rodriguez]

This logic no longer seems to be necessary since the adjustCompilationLevel callback has been removed.

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Commit messages:
 - 8218885: Restore pop_frame and force_early_return functionality for Graal

Changes: https://git.openjdk.java.net/jdk/pull/5625/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5625&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8218885
  Stats: 8 lines in 1 file changed: 0 ins; 8 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5625.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5625/head:pull/5625

PR: https://git.openjdk.java.net/jdk/pull/5625