Migrate static handling and most of the operand codegen code to StableMIR #5920

Job	Run time
benchcomp-tests	3m 18s
bookrunner	16m 12s
perf	27m 55s
regression (macos-12)	24m 39s
regression (ubuntu-20.04)	20m 16s
write-json-symtab-regression	12m 6s
regression (ubuntu-22.04)	21m 34s
	2h 6m 0s

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