added memcpy/memmove tests for non-zero multiples of 65536 #527

Job	Run time
docs	3m 48s
build-and-test (ubuntu-22.04, YES)	4m 43s
build-and-test (macos-14, YES)	2m 40s
build-and-test (macos-15-intel, YES)	5m 35s
build-and-test (macos-14, NO)	2m 53s
build-and-test (windows-latest, NO)	5m 39s
build-and-test (macos-15-intel, NO)	6m 20s
build-and-test (windows-latest, YES)	5m 34s
build-and-test (ubuntu-22.04, NO)	3m 17s
	40m 29s

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