RFR: 8331736: C2: Live Node limit exceeded limit after JDK-8316991 [v2]

[Cesar Soares Lucas]

> Please, consider this patch to interrupt execution of `split_unique_types` (SUT) when number of live nodes reaches 3/4 of `max_live_nodes`.
> 
> The included test case reproduces the problem. The number of live nodes before running phase 3 of SUT is ~20k, after processing about 750 mergemem nodes the number of live nodes is over 70k. This problem was first encountered when running an old `.jar` file that was created before `invokedynamic` optimizations - that's why I disable string optimizations in the test case. The test case is strongly based on [the method that was originally triggering the problem](https://github.com/Unidata/netcdf-java/blob/c782ef80ab54a09befd6d5065c6baeed54949222/cdm/radial/src/main/java/ucar/nc2/iosp/nids/Nidsheader.java#L2174).
> 
> Tested on Linux, Win, Mac x86_64 tier1-3 and GHA.

Cesar Soares Lucas has updated the pull request incrementally with one additional commit since the last revision:

  Address PR feedback: formatting & additional test run.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/19545/files
  - new: https://git.openjdk.org/jdk/pull/19545/files/1e92268a..73808e42

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19545&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19545&range=00-01

  Stats: 5 lines in 2 files changed: 1 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/19545.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19545/head:pull/19545

PR: https://git.openjdk.org/jdk/pull/19545