build

Add runtime_metaprogramming extension #23199

Job	Run time
runtime5 (x86_64-linux)	1m 5s
runtime5 dev (x86_64-linux)	1m 26s
runtime5 poll-insertion (x86_64-linux)	1m 5s
runtime5 multidomain (x86_64-linux)	1m 11s
runtime5 stack-checks (x86_64-linux)	1m 15s
runtime5 debug stack-checks (x86_64-linux)	58s
runtime5 debug (x86_64-linux)	1m 5s
runtime5 regalloc (aarch64-linux)	54s
runtime5 debug regalloc (aarch64-darwin)	1m 29s
runtime4 dev (x86_64-linux)	1m 1s
runtime4 O3 (x86_64-linux)	47s
runtime4 O3 metrics (x86_64-linux)	1m 9s
runtime5 frame-pointers irc (x86_64-linux)	55s
runtime4 Oclassic frame-pointers poll-insertion flambda-invariants (x86_64-linux)	1m 16s
runtime4 (aarch64-darwin)	1m 24s
runtime5 regalloc (aarch64-darwin)	1m 12s
runtime5 dwarf-tests (x86_64-linux)	2m 16s
runtime5 vectorizer (x86_64-linux)	1m 2s
runtime5 frame-pointers llvmize-tests (x86_64-linux)	1m 55s
runtime4 address-sanitizer (x86_64-linux)	1m 33s
runtime4 regalloc (x86_64-linux)	1m 16s
runtime5 address-sanitizer (x86_64-linux)	1m 17s
runtime5 cfg-invariants (x86_64-linux)	1m 33s
	29m 4s

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