Ruby

Merge pull request #2836 from ksss/fix-gc-compact #7833

Job	Run time
C99_compile (4.0)	49s
C99_compile (head)	1m 31s
test (head, test)	3m 14s
test (3.4, test)	2m 44s
test (4.0, test)	2m 36s
test (3.3, test)	3m 4s
test (head, stdlib_test rubocop)	3m 5s
test (3.2, test)	2m 30s
test (4.0, test, --enable-frozen-string-literal)	2m 33s
test (4.0, stdlib_test)	2m 1s
test (asan-release, test)	8m 48s
test (4.0, typecheck_test)	1m 22s
test (4.0, rubocop validate test_doc build test_generate_stdlib raap)	3m 2s
test (4.0, stdlib_test, --enable-frozen-string-literal)	2m 8s
	39m 27s

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