RFR: Merge openjdk/jdk:master

[William Kemper]

Merges tag jdk-24+9

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

Commit messages:
 - 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
 - 8337031: Improvements to CompilationMemoryStatistic
 - ... and 20 more: https://git.openjdk.org/shenandoah/compare/bd36b6ae...e4c7850c

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

Changes: https://git.openjdk.org/shenandoah/pull/465/files
  Stats: 3344 lines in 154 files changed: 2135 ins; 784 del; 425 mod
  Patch: https://git.openjdk.org/shenandoah/pull/465.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah.git pull/465/head:pull/465

PR: https://git.openjdk.org/shenandoah/pull/465