Ruby

Merge pull request #2517 from ruby/lower-bound-doc #6921

Job	Run time
C99_compile (3.4)	1m 6s
test (3.1, test)	2m 55s
C99_compile (head)	1m 34s
test (3.2, test)	2m 45s
test (3.3, test)	3m 12s
valgrind	52m 2s
test (3.4, test)	3m 0s
test (head, test)	3m 27s
test (head, stdlib_test rubocop)	3m 27s
test (3.4, stdlib_test)	2m 23s
test (3.4, test, --enable-frozen-string-literal)	3m 0s
test (3.4, stdlib_test, --enable-frozen-string-literal)	2m 11s
test (3.4, rubocop validate test_doc build test_generate_stdlib raap)	2m 41s
test (3.4, typecheck_test)	1m 14s
	1h 24m 57s

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