Support `alignof` and `instance_alignof` #2615

Job	Run time
check_format	1m 46s
deploy_api_docs	0s
x86_64-gnu-test (1.7.3)	31m 45s
x86_64-gnu-test-preview_mt	5m 28s
x86_64-gnu-test (1.8.2)	30m 30s
x86_64-musl-test	33m 56s
x86_64-gnu-test (1.9.2)	30m 43s
x86_64-gnu-test (1.10.1)	30m 48s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	31m 20s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	32m 57s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	34m 19s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	29m 45s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	33m 6s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	32m 31s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	30m 31s
	6h 29m 25s

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