Fix #15007: `isAttributeNoreturn` not set for `_Noreturn` #20791

Job	Run time
build_make (alpine:3.23)	4m 53s
build_cmake (ubuntu:24.04, true, true)	2m 59s
build_make (ubuntu:25.10)	2m 44s
build_cmake (alpine:3.23, false, false)	4m 13s
build_make (ubuntu:24.04)	3m 57s
build_cmake (ubuntu:25.10, true, true)	3m 14s
	22m 0s

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