Bump LLVM to llvm/llvm-project@21edac25f09faee23015c6a69d95fcbda287efe2 #33335

Job	Run time
setup / setup	8s
runtime_small	2m 12s
runtime :: ubuntu-24.04	2m 13s
runtime_tracing :: tracy provider	1m 1s
runtime :: windows-2022	2m 35s
runtime_tracing :: console provider	1m 4s
runtime :: macos-14	1m 22s
linux_x64_bazel / linux_x64_bazel	2m 42s
linux_x64_clang / linux_x64_clang	2m 32s
linux_x64_clang_asan / linux_x64_clang_asan	4m 34s
ci_summary / summary	3s
	20m 26s

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