Rework initialization of constants & class variables #13239

Job	Run time
x86_64-gnu-test (1.7.3)	38m 43s
x86_64-gnu-test (1.8.2)	35m 35s
x86_64-gnu-test-preview_mt	5m 55s
x86_64-gnu-test (1.9.2)	34m 40s
x86_64-musl-test	35m 9s
x86_64-gnu-test (1.10.1)	33m 26s
x86_64-gnu-test (1.11.2)	32m 55s
check_format	1m 38s
x86_64-gnu-test (1.12.2)	33m 22s
x86_64-gnu-test (1.13.3)	35m 58s
x86_64-gnu-test (1.14.1)	32m 38s
x86_64-gnu-test (1.15.0)	34m 9s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	35m 18s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	33m 40s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	34m 23s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	35m 12s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	32m 42s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	35m 27s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	32m 11s
	9h 53m 1s

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