Ruby

Merge pull request #2565 from ksss/typecheck-value-is_a #7069

Job	Run time
C99_compile (head)	1m 30s
C99_compile (3.4)	1m 5s
test (3.4, test)	3m 13s
test (3.4, test, --enable-frozen-string-literal)	3m 12s
test (3.3, test)	3m 37s
test (3.4, stdlib_test)	2m 17s
test (3.1, test)	3m 2s
test (head, test)	3m 51s
test (head, stdlib_test rubocop)	3m 20s
test (3.2, test)	3m 1s
test (3.4, stdlib_test, --enable-frozen-string-literal)	2m 20s
test (3.4, rubocop validate test_doc build test_generate_stdlib raap)	3m 5s
test (3.4, typecheck_test)	1m 17s
	34m 50s

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