JIT

GH-128563: Generate `opcode = ...` in instructions that need `opcode`… #2688

Job	Run time
Interpreter (Debug)	7m 36s
Free-Threaded (Debug) (19)	12m 8s
i686-pc-windows-msvc/msvc (Debug)	17m 30s
i686-pc-windows-msvc/msvc (Release)	11m 17s
x86_64-pc-windows-msvc/msvc (Debug)	16m 44s
x86_64-pc-windows-msvc/msvc (Release)	9m 56s
aarch64-pc-windows-msvc/msvc (Debug)	5m 20s
aarch64-pc-windows-msvc/msvc (Release)	5m 47s
x86_64-apple-darwin/clang (Debug)	14m 17s
x86_64-apple-darwin/clang (Release)	9m 51s
aarch64-apple-darwin/clang (Debug)	10m 54s
aarch64-apple-darwin/clang (Release)	8m 46s
x86_64-unknown-linux-gnu/gcc (Debug)	8m 44s
x86_64-unknown-linux-gnu/gcc (Release)	6m 37s
aarch64-unknown-linux-gnu/gcc (Debug)	5m 55s
aarch64-unknown-linux-gnu/gcc (Release)	5m 7s
	2h 36m 29s

Provide feedback