JIT

gh-145866: Convert `DICT_MERGE` to leave its inputs on the stack to b… #7043

Job	Run time
x86_64-apple-darwin/clang (Release)	42m 21s
aarch64-apple-darwin/clang (Release)	11m 31s
Interpreter (Debug)	12m 19s
JIT without optimizations (Debug)	3m 29s
JIT with tail calling interpreter	4m 31s
x86_64-pc-windows-msvc/msvc (Debug)	29m 17s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 39s
aarch64-apple-darwin/clang (Debug)	12m 1s
aarch64-pc-windows-msvc/msvc (Release)	19m 43s
x86_64-unknown-linux-gnu/gcc (Debug)	14m 12s
x86_64-pc-windows-msvc/msvc (Release)	14m 57s
i686-pc-windows-msvc/msvc (Release)	15m 19s
aarch64-unknown-linux-gnu/gcc (Release)	7m 0s
x86_64-unknown-linux-gnu/gcc (Release)	9m 3s
aarch64-pc-windows-msvc/msvc (Debug)	24m 45s
x86_64-apple-darwin/clang (Debug)	40m 5s
Free-Threaded (Debug)	3m 52s
i686-pc-windows-msvc/msvc (Debug)	29m 8s
	5h 2m 12s

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