Do not ignore safeToRemove instructions with no users #352

Job	Run time
result-viewer (14.x)	1m 39s
cache-kernels	13s
code-style	33s
result-viewer (16.x)	59s
result-viewer (18.x)	1m 22s
result-viewer (20.x)	1m 19s
build-and-test (9, gcc-9, g++-9, OFF, true)	19m 36s
build-and-test (10, gcc-9, g++-9, OFF, true)	19m 59s
build-and-test (11, gcc-9, g++-9, OFF, true)	20m 9s
build-and-test (12, gcc-9, g++-9, OFF, true)	23m 5s
build-and-test (13, gcc-9, g++-9, OFF, true)	20m 5s
build-and-test (14, gcc-9, g++-9, OFF, true)	21m 22s
build-and-test (15, gcc-9, g++-9, OFF, true)	23m 37s
build-and-test (16, gcc-9, g++-9, OFF, true)	21m 31s
build-and-test (16, clang, clang++, OFF, true)	23m 23s
build-and-test (14, gcc-9, g++-9, ON, false)	4m 6s
	3h 22m 58s

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