always reinstantiate nominal values of generic instantiations #27981

Job	Run time
ubuntu-20.04 (batch: allowed_failures)	4m 31s
ubuntu-20.04 (batch: 0_3)	24m 55s
ubuntu-20.04 (batch: 1_3)	28m 52s
ubuntu-20.04 (batch: 2_3)	23m 24s
macos-13 (batch: allowed_failures)	9m 19s
macos-13 (batch: 0_3)	36m 17s
macos-13 (batch: 1_3)	34m 31s
macos-13 (batch: 2_3)	29m 16s
	3h 11m 5s

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