Fix #14885 Shift by negative value in TemplateSimplifier::simplifyNum… #20208

Job	Run time
build_make (alpine:3.23)	4m 42s
build_make (ubuntu:25.10)	4m 0s
build_cmake (alpine:3.23, false, false)	4m 17s
build_make (ubuntu:24.04)	4m 12s
build_cmake (ubuntu:24.04, true, true)	5m 4s
build_cmake (ubuntu:25.10, true, true)	5m 30s
	27m 45s

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