cgen: fix array fixed code generation for more than 1 dimension (fix … #330

Job	Run time
tests-sanitize-address-clang	2h 9m 48s
tests-sanitize-address-gcc	2h 39m 44s
tests-sanitize-address-msvc	4m 11s
tests-sanitize-memory-clang	3h 30m 5s
tests-sanitize-undefined-clang	1h 2m 29s
tests-sanitize-undefined-gcc	1h 37m 11s
	11h 3m 28s

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