JIT

gh-145866: Convert `DICT_MERGE` to leave its inputs on the stack to b… #5634

Job	Run time
Interpreter (Debug)	12m 32s
x86_64-unknown-linux-gnu/gcc (Debug)	13m 57s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 43s
Free-Threaded (Debug)	3m 41s
x86_64-unknown-linux-gnu/gcc (Release)	8m 54s
x86_64-apple-darwin/clang (Debug)	37m 15s
x86_64-apple-darwin/clang (Release)	28m 58s
x86_64-pc-windows-msvc/msvc (Debug)	28m 21s
aarch64-apple-darwin/clang (Debug)	13m 37s
JIT without optimizations (Debug)	3m 45s
aarch64-pc-windows-msvc/msvc (Debug)	27m 24s
aarch64-apple-darwin/clang (Release)	13m 9s
JIT with tail calling interpreter	4m 16s
aarch64-pc-windows-msvc/msvc (Release)	18m 41s
i686-pc-windows-msvc/msvc (Debug)	26m 6s
x86_64-pc-windows-msvc/msvc (Release)	15m 48s
aarch64-unknown-linux-gnu/gcc (Release)	6m 44s
i686-pc-windows-msvc/msvc (Release)	14m 15s
	4h 46m 6s

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