Add `@[Linkage("value")]` annotation (applies to `fun`) #13438

Job	Run time
check_format	1m 38s
x86_64-gnu-test (1.7.3)	36m 58s
x86_64-gnu-test (1.8.2)	35m 13s
x86_64-gnu-test (1.9.2)	32m 49s
x86_64-gnu-test (1.10.1)	33m 59s
x86_64-gnu-test (1.11.2)	33m 34s
x86_64-gnu-test (1.12.2)	32m 18s
x86_64-gnu-test (1.13.3)	35m 35s
x86_64-gnu-test-preview_mt	5m 47s
x86_64-gnu-test (1.14.1)	33m 13s
x86_64-gnu-test (1.15.1)	33m 2s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	32m 5s
x86_64-musl-test	37m 34s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	35m 0s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	33m 40s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	32m 53s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	33m 41s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	33m 38s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	33m 44s
	9h 46m 21s

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