RFR: 8327247: C2 uses up to 2GB of RAM to compile complex string concat in extreme cases [v2]

[Claes Redestad]

> Splitting out the ASM-based version from #18690 to push that first under the JBS (to help backporting). Keeping #18690 open to rebase and follow-up on this as a subtask. See discussion in that #18690 for more details, discussion and motivation for this.

Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:

  Remove accidental use of java.lang.classfile

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18953/files
  - new: https://git.openjdk.org/jdk/pull/18953/files/d8d5e5d3..a4dfbfca

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18953&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18953&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18953.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18953/head:pull/18953

PR: https://git.openjdk.org/jdk/pull/18953