gh-148211: decompose `[_POP_TWO/_INSERT_2]_LOAD_CONST_INLINE_BORROW` … #2296

Job	Run time
aarch64-apple-darwin/clang	8m 24s
x86_64-apple-darwin/clang	14m 51s
x86_64-unknown-linux-gnu/gcc	9m 27s
aarch64-unknown-linux-gnu/gcc	7m 25s
x86_64-unknown-linux-gnu/gcc-free-threading	7m 38s
	47m 45s

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