[lworld] RFR: Merge jdk

[David Simms]

Merge jdk-24+7
Merge jdk-24+8
Merge jdk-24+9

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

Commit messages:
 - Merge tag 'jdk-24+9' into lworld_merge_jdk_24_7
 - 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 224 more: https://git.openjdk.org/valhalla/compare/a59ca590...ea380af7

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lworld: https://webrevs.openjdk.org/?repo=valhalla&pr=1278&range=00.0
 - jdk: https://webrevs.openjdk.org/?repo=valhalla&pr=1278&range=00.1

Changes: https://git.openjdk.org/valhalla/pull/1278/files
  Stats: 24015 lines in 793 files changed: 14516 ins; 6394 del; 3105 mod
  Patch: https://git.openjdk.org/valhalla/pull/1278.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1278/head:pull/1278

PR: https://git.openjdk.org/valhalla/pull/1278