JIT

GH-128563: Generate `opcode = ...` in instructions that need `opcode` #2685

Job	Run time
Interpreter (Debug)	8m 2s
Free-Threaded (Debug) (19)	13m 6s
i686-pc-windows-msvc/msvc (Debug)	18m 9s
i686-pc-windows-msvc/msvc (Release)	11m 49s
x86_64-pc-windows-msvc/msvc (Debug)	17m 23s
x86_64-pc-windows-msvc/msvc (Release)	10m 52s
aarch64-pc-windows-msvc/msvc (Debug)	4m 38s
aarch64-pc-windows-msvc/msvc (Release)	6m 1s
x86_64-apple-darwin/clang (Debug)	13m 50s
x86_64-apple-darwin/clang (Release)	9m 0s
aarch64-apple-darwin/clang (Debug)	9m 6s
aarch64-apple-darwin/clang (Release)	9m 11s
x86_64-unknown-linux-gnu/gcc (Debug)	8m 29s
x86_64-unknown-linux-gnu/gcc (Release)	6m 16s
aarch64-unknown-linux-gnu/gcc (Debug)	5m 44s
aarch64-unknown-linux-gnu/gcc (Release)	4m 50s
	2h 36m 26s

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