emitBytecode
private fun emitBytecode(w: PlainEngine.Warm, targetId: TargetId, frontend: AllModulesFrontendOutput, reporter: BaseDiagnosticsCollector, yieldTypes: Map<Pair<Int, Int>, String>): PlainEngine.Emitted
Resolved FIR through fir2ir and the JVM backend. yieldTypes rides along as one more IR extension — the conversion is where an IrCall is still a call, so it is the only window to fill its arguments.