Optimize storing into uninit locations for arrays and seqs. #28453

Job	Run time
ubuntu-22.04 (batch: allowed_failures)	3m 59s
ubuntu-22.04 (batch: 0_3)	33m 51s
ubuntu-22.04 (batch: 1_3)	26m 30s
ubuntu-22.04 (batch: 2_3)	23m 45s
macos-13 (batch: allowed_failures)	6m 28s
macos-13 (batch: 0_3)	52m 50s
macos-13 (batch: 1_3)	36m 0s
macos-13 (batch: 2_3)	34m 24s
	3h 37m 47s

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