Bump LLVM to llvm/llvm-project@21edac25f09faee23015c6a69d95fcbda287efe2 #33336

Job	Run time
setup / setup	6s
runtime_small	3m 53s
runtime_tracing :: tracy provider	1m 24s
runtime_tracing :: console provider	1m 7s
runtime :: ubuntu-24.04	1m 15s
runtime :: windows-2022	3m 9s
runtime :: macos-14	1m 23s
linux_x64_bazel / linux_x64_bazel	18m 31s
linux_x64_clang / linux_x64_clang	26m 43s
linux_x64_clang_asan / linux_x64_clang_asan	31m 27s
ci_summary / summary	2s
	1h 29m 0s

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