RFR: 8255429: Remove C2-based profiling

Tue Oct 27 23:21:23 UTC 2020

If there are no objections I'd like to remove some obsolete code that was an experiment to implement profiling in C2. It was added during the first tiered compilation experiments and is not unused.

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Commit messages:
 - Remove obsolete C2-based profiling.

Changes: https://git.openjdk.java.net/jdk/pull/888/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=888&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255429
  Stats: 469 lines in 9 files changed: 0 ins; 429 del; 40 mod
  Patch: https://git.openjdk.java.net/jdk/pull/888.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/888/head:pull/888

PR: https://git.openjdk.java.net/jdk/pull/888