JIT

GH-128563: Generate `opcode = ...` in instructions that need `opcode` #2687

Job	Run time
Interpreter (Debug)	7m 35s
Free-Threaded (Debug) (19)	12m 16s
i686-pc-windows-msvc/msvc (Debug)	19m 17s
i686-pc-windows-msvc/msvc (Release)	12m 23s
x86_64-pc-windows-msvc/msvc (Debug)	18m 57s
x86_64-pc-windows-msvc/msvc (Release)	12m 13s
aarch64-pc-windows-msvc/msvc (Debug)	6m 26s
aarch64-pc-windows-msvc/msvc (Release)	7m 45s
x86_64-apple-darwin/clang (Debug)	12m 52s
x86_64-apple-darwin/clang (Release)	9m 2s
aarch64-apple-darwin/clang (Debug)	12m 14s
aarch64-apple-darwin/clang (Release)	9m 28s
x86_64-unknown-linux-gnu/gcc (Debug)	8m 45s
x86_64-unknown-linux-gnu/gcc (Release)	5m 49s
aarch64-unknown-linux-gnu/gcc (Debug)	5m 57s
aarch64-unknown-linux-gnu/gcc (Release)	5m 0s
	2h 45m 59s

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