[master] RFR: Merge jdk:jdk-24+9

[Roman Kennke]

Merges upstream tag merge-jdk-24+9 such that the repo is identical to that tag afterwards. I.e. we discard all changes from the lilliput repo, because JEP-450 has been upstreamed and that subsumes all work that we have maintained here.

The plan is to shift this repo to development work on Lilliput-2 ('4-byte-headers').

Ok?

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Commit messages:
 - Merge branch 'master' into merge-jdk-24+9
 - 8337027: Parallel: Obsolete BaseFootPrintEstimate
 - 8324345: Stack overflow during C2 compilation when splitting memory phi
 - 8331090: Run Ideal_minmax before de-canonicalizing CMoves
 - 8337421: RISC-V: client VM build failure after JDK-8335191
 - 8337523: Fix -Wzero-as-null-pointer-constant warnings in jvmci code
 - 8337418: Fix -Wzero-as-null-pointer-constant warnings in prims code
 - 8336635: Add IR test for Reference.refersTo intrinsic
 - 8336242: compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/SimpleDebugInfoTest.java failed assert(oopDesc::is_oop_or_null(val)) failed: bad oop found (again)
 - 8336912: G1: Undefined behavior for G1ConfidencePercent=0
 - ... and 460 more: https://git.openjdk.org/lilliput/compare/fdfcf46a...a90def59

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.org/lilliput/pull/189/files
  Stats: 62476 lines in 1790 files changed: 33010 ins; 21022 del; 8444 mod
  Patch: https://git.openjdk.org/lilliput/pull/189.diff
  Fetch: git fetch https://git.openjdk.org/lilliput.git pull/189/head:pull/189

PR: https://git.openjdk.org/lilliput/pull/189