Use jtckdint.h for checked integer operations #693

Job	Run time
build (AppleClang, Headers, Debug)	51s
build (AppleClang, Headers, Release)	58s
build (LLVM-Clang-16, Headers, Debug)	1m 4s
build (LLVM-Clang-16, Headers, Release)	1m 14s
build (LLVM-Clang-17, Headers, Debug)	1m 12s
build (LLVM-Clang-17, Headers, Release)	1m 39s
build (LLVM-Clang-17, Module, Debug)	1m 5s
build (LLVM-Clang-17, Module, Release)	1m 10s
build (LLVM-Clang-18, Headers, Debug)	50s
build (LLVM-Clang-18, Headers, Release)	1m 21s
build (LLVM-Clang-18, Module, Debug)	53s
build (LLVM-Clang-18, Module, Release)	57s
build (LLVM-Clang-19, Headers, Debug)	1m 16s
build (LLVM-Clang-19, Headers, Release)	1m 14s
build (LLVM-Clang-19, Module, Debug)	1m 33s
build (LLVM-Clang-19, Module, Release)	1m 21s
	18m 38s

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