Ruby

Run the test suite on JRuby (JRuby support, step 4) #8295

Job	Run time
clang_compile (4.0)	50s
C99_compile (4.0)	49s
C99_compile (head)	51s
clang_compile (head)	47s
test (3.2, test)	2m 14s
test (asan-release, test)	8m 12s
test (4.0, stdlib_test)	1m 55s
test (head, test)	1m 28s
test (4.0, test, --enable-frozen-string-literal)	2m 18s
test (4.0, rubocop validate test_doc build test_generate_stdlib raap)	2m 16s
test (4.0, typecheck_test)	1m 29s
test (head, stdlib_test rubocop)	2m 12s
test (4.0, stdlib_test, --enable-frozen-string-literal)	1m 50s
test (3.3, test)	2m 26s
test (4.0, test)	2m 18s
test (3.4, test)	2m 25s
	34m 20s

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