test

Add LAC (Lookahead Correction) support #2172

Job	Run time
test-windows (head)	1m 33s
check-misc (head)	9s
test-ruby (head, master)	6m 28s
steep-check (3.4)	14s
test-memory (head)	58s
ruby-versions / Generate Ruby versions	5s
test-ruby (3.1, master)	6m 22s
test-cpp (head, clang++)	23s
test-c (head, gcc)	19s
test-c (head, clang)	23s
test-c (head, cc)	18s
test (head)	22s
test (2.7)	44s
test (3.3)	33s
test (3.2)	27s
test (3.1)	27s
test (2.5)	41s
test (2.6)	44s
test (3.4)	28s
test (3.0)	25s
test (4.0)	23s
test-cpp (head, g++)	18s
	22m 44s

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