gh-152375: Fix UB in `INSTRUMENTED_JUMP` #3272

Job	Run time
x86_64-apple-darwin/clang	15m 42s
aarch64-apple-darwin/clang	11m 20s
x86_64-unknown-linux-gnu/gcc	10m 21s
aarch64-unknown-linux-gnu/gcc	6m 43s
x86_64-unknown-linux-gnu/gcc-free-threading	6m 42s
	50m 48s

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