Bound POSIX SHM mapping by the shared object size #1210

Job	Run time
coverage (she, SHE=1)	27s
coverage (auth, AUTH=1)	38s
coverage (base)	35s
coverage (dma, DMA=1)	1m 44s
coverage (threadsafe, THREADSAFE=1)	39s
coverage (nocrypto, NOCRYPTO=1)	15s
merge	25s
	4m 43s

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