gh-148211: decompose `[_POP_TWO/_INSERT_2]_LOAD_CONST_INLINE_BORROW` … #2737

Job	Run time
aarch64-apple-darwin/clang	8m 24s
aarch64-unknown-linux-gnu/gcc	7m 21s
x86_64-apple-darwin/clang	15m 14s
x86_64-unknown-linux-gnu/gcc-free-threading	7m 29s
x86_64-unknown-linux-gnu/gcc	10m 1s
	48m 29s

Provide feedback