Include `Add<&Self>` in `SharedValue` #5202

Job	Run time
Release builds and tests	9m 36s
Additional Builds and Concurrency Tests	13m 0s
Basic Checks	19m 54s
Slow tests	11m 14s
miri	2m 52s
sanitize (address)	17m 48s
Measure coverage	27m 8s
sanitize (address, multi-threading)	18m 56s
sanitize (leak)	7m 44s
sanitize (leak, multi-threading)	8m 13s
	2h 16m 25s

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