gh-152375: Fix UB in `INSTRUMENTED_JUMP` #3274

Job	Run time
x86_64-unknown-linux-gnu/gcc	10m 16s
x86_64-apple-darwin/clang	23m 24s
x86_64-unknown-linux-gnu/gcc-free-threading	7m 32s
aarch64-apple-darwin/clang	9m 52s
aarch64-unknown-linux-gnu/gcc	7m 2s
	58m 6s

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