JIT

GH-128563: Generate `opcode = ...` in instructions that need `opcode`… #16

Job	Run time
Interpreter (Debug)	7m 46s
Free-Threaded (Debug) (19)	12m 25s
i686-pc-windows-msvc/msvc (Debug)	17m 15s
i686-pc-windows-msvc/msvc (Release)	10m 45s
x86_64-pc-windows-msvc/msvc (Debug)	18m 8s
x86_64-pc-windows-msvc/msvc (Release)	11m 38s
aarch64-pc-windows-msvc/msvc (Debug)	5m 37s
aarch64-pc-windows-msvc/msvc (Release)	6m 24s
x86_64-apple-darwin/clang (Debug)	17m 14s
x86_64-apple-darwin/clang (Release)	11m 52s
aarch64-apple-darwin/clang (Debug)	9m 38s
aarch64-apple-darwin/clang (Release)	8m 22s
x86_64-unknown-linux-gnu/gcc (Debug)	8m 57s
x86_64-unknown-linux-gnu/gcc (Release)	5m 45s
aarch64-unknown-linux-gnu/gcc (Debug)	5m 50s
aarch64-unknown-linux-gnu/gcc (Release)	5m 0s
	2h 42m 36s

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