Fix #14885 Shift by negative value in TemplateSimplifier::simplifyNum… #948

Job	Run time
build (asan, -DANALYZE_ADDRESS=On, true, process, false)	19m 45s
build (tsan, -DANALYZE_THREAD=On, false, thread, false, --executor=thread --error-exitcode=0)	17m 30s
build (ubsan, -DANALYZE_UNDEFINED=On, true, process, true)	42m 23s
	1h 19m 38s

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