gh-131798: do not watch immutable types in JIT (#148383) #2298

Job	Run time
x86_64-apple-darwin/clang	16m 1s
aarch64-apple-darwin/clang	10m 11s
x86_64-unknown-linux-gnu/gcc	10m 6s
aarch64-unknown-linux-gnu/gcc	7m 11s
x86_64-unknown-linux-gnu/gcc-free-threading	8m 8s
	51m 37s

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