gh-148211: decompose `_INSERT_1_LOAD_CONST_INLINE(_BORROW)` in JIT #2696

Job	Run time
x86_64-unknown-linux-gnu/gcc	10m 33s
x86_64-apple-darwin/clang	58s
x86_64-unknown-linux-gnu/gcc-free-threading	9m 4s
aarch64-apple-darwin/clang	8m 50s
aarch64-unknown-linux-gnu/gcc	7m 40s
	37m 5s

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