deferBitsAddr *ssa.Value
	deferBitsTemp *ir.Name

	// line number stack. The current line number is top of stack
	line []src.XPos
	// the last line number processed; it may have been popped
	lastPos src.XPos

	// list of panic calls by function name and line number.
	// Used to deduplicate panic calls.
	panics map[funcLine]*ssa.Block

	cgoUnsafeArgs       bool