MA0042 skips MemoryStream when type is explicit #1369

Job	Run time
compute_package_version	3s
check_documentation	33s
build_and_test (ubuntu-latest, Release, roslyn3.8)	2m 6s
build_and_test (ubuntu-latest, Release, roslyn4.2)	2m 7s
build_and_test (ubuntu-latest, Release, roslyn4.4)	2m 15s
build_and_test (ubuntu-latest, Release, roslyn4.6)	2m 8s
build_and_test (ubuntu-latest, Release, roslyn4.8)	2m 0s
build_and_test (ubuntu-latest, Release, default)	2m 2s
build_and_test (windows-latest, Release, roslyn3.8)	4m 36s
build_and_test (windows-latest, Release, roslyn4.2)	4m 33s
build_and_test (windows-latest, Release, roslyn4.4)	4m 36s
build_and_test (windows-latest, Release, roslyn4.6)	3m 56s
build_and_test (windows-latest, Release, roslyn4.8)	3m 58s
build_and_test (windows-latest, Release, default)	4m 9s
create_nuget	2m 18s
validate_nuget	52s
deploy	15s
create_release	4s
	42m 31s

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