func applyRewrite(f *Func, rb blockRewriter, rv valueRewriter, deadcode deadValueChoice) {
	// repeat rewrites until we find no more rewrites
	pendingLines := f.cachedLineStarts // Holds statement boundaries that need to be moved to a new value/block
	pendingLines.clear()
	debug := f.pass.debug
	if debug > 1 {
		fmt.Printf("%s: rewriting for %s\n", f.pass.name, f.Name)
	}

// On a related note, small objects are always small enough that their bitmap
// fits in goarch.PtrSize*8 bits, so writing out bitmap data takes two bitmap
// writes at most (because object boundaries don't generally lie on
// s.heapBits()[i] boundaries).
//
// For larger objects, if t is the type for the object starting at "start",
// within some span whose mspan is s, then the bitmap at t.GCData is "tiled"

	// of the steps we need with a single traceback printer implementation.
	//
	// We could be more lax about exactly how many frames we print, for example
	// always stopping and resuming on physical frame boundaries, or at least
	// cgo expansion boundaries. It's not clear that's much simpler.
	flags |= unwindPrintErrors
	var u unwinder
	tracebackWithRuntime := func(showRuntime bool) int {
		const maxInt int = 0x7fffffff

//
// The calendar runs on an exact 400 year cycle: a 400-year calendar
// printed for 1970-2369 will apply as well to 2370-2769. Even the days
// of the week match up. It simplifies the computations to choose the
// cycle boundaries so that the exceptional years are always delayed as
// long as possible. That means choosing a year equal to 1 mod 400, so
// that the first leap year is the 4th year, the first missed leap year

		talign := t.Align
		if f.BitOffset > 0 || f.BitSize > 0 {
			// The layout of bitfields is implementation defined,
			// so we don't know how they correspond to Go fields
			// even if they are aligned at byte boundaries.
			continue
		}

		if talign > 0 && f.ByteOffset%talign != 0 {
			// Drop misaligned fields, the same way we drop integer bit fields.
			// The goal is to make available what can be made available.