Migrate static handling and most of the operand codegen code to StableMIR #5922

Job	Run time
perf	27m 2s
benchcomp-tests	3m 20s
regression (macos-12)	23m 10s
bookrunner	15m 31s
regression (ubuntu-20.04)	19m 15s
write-json-symtab-regression	10m 52s
regression (ubuntu-22.04)	20m 55s
	2h 0m 5s

Provide feedback