Backed out changeset 192cc007fef6 (bug 1742864) for xpcshell failure on test_dmd.js

  FrameSkipper skipper(aFirstFramePC);

  uint32_t numFrames = 0;

  // Sanitize the given aBp. Assume that something reasonably close to

  // but before the stack end is going be a valid frame pointer. Also

  // check that it is an aligned address. This increases the chances

  // that if the pointer is not valid (which might happen if the caller

  // called __builtin_frame_address(1) and its frame is busted for some

  // reason), we won't read it, leading to a crash. Because the calling

  // code is not using frame pointers when returning, it might actually

  // recover just fine.

  static const uintptr_t kMaxStackSize = 8 * 1024 * 1024;

  if (uintptr_t(aBp) < uintptr_t(aStackEnd) - kMaxStackSize ||

      aBp >= aStackEnd || (uintptr_t(aBp) & 3)) {

    return;

  }

  while (aBp) {

    void** next = (void**)*aBp;

    // aBp may not be a frame pointer on i386 if code was compiled with