// Keep this code in sync with cmd/compile/internal/walk/builtin.go:walkUnsafeSlice
func unsafeslice64(et *_type, ptr unsafe.Pointer, len64 int64) {
	len := int(len64)
	if int64(len) != len64 {
		panicunsafeslicelen1(getcallerpc())
	}
	unsafeslice(et, ptr, len)
}

func unsafeslicecheckptr(et *_type, ptr unsafe.Pointer, len64 int64) {
	unsafeslice64(et, ptr, len64)

	// Check that underlying array doesn't straddle multiple heap objects.