//	10000000 n c: repeat the previous n bits c times; n, c are varints
//	1nnnnnnn c: repeat the previous n bits c times; c is a varint

// runGCProg returns the number of 1-bit entries written to memory.
func runGCProg(prog, dst *byte) uintptr {
	dstStart := dst

	// Bits waiting to be written to memory.
	var bits uintptr
	var nbits uintptr

	p := prog
Run:
	for {

	p := typ.GCData // start of 1-bit pointer mask (or GC program)
	var gcProgBits uintptr
	if typ.Kind_&abi.KindGCProg != 0 {
		// Expand gc program, using the object itself for storage.
		gcProgBits = runGCProg(addb(p, 4), (*byte)(ptr))
		p = (*byte)(ptr)
	}
	nb := typ.PtrBytes / goarch.PtrSize

	for i := uintptr(0); i < nb; i += ptrBits {
		k := nb - i
		if k > ptrBits {
			k = ptrBits
		}