Attach (recommended) or Link to PDF file here:
[双引号不正常.pdf](https://github.com/mozilla/pdf.js/files/3533108/default.pdf)


Configuration:
- Web browser and its version:  IE11 , chrome 
- Operating system and its version:  win7
- PDF.js version:  master
- Is a browser extension: nothing 
teps to reproduce the problem:
1. viewer.html web  online preview


What is the expected behavior? (add screenshot)
Displayed in normal characters.

What went wrong? (add screenshot)
![20190823143813](https://user-images.githubusercontent.com/6269307/63571860-062e6600-c5b4-11e9-9fff-75d65cf6bade.png)

Not only the two characters I took screenshots, but also a lot of garbled Chinese punctuation. For example, the Chinese 《》 symbol. But these garbled characters only appear in some specific very old pdf files.

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):nothing 

const ranges = getRanges(glyphs, numGlyphs);
  const numTables = ranges[ranges.length - 1][1] > 0xffff ? 2 : 1;
  let cmap =
    "\x00\x00" + 
    string16(numTables) + 
    "\x00\x03" + 
    "\x00\x01" + 
    string32(4 + numTables * 8); 
  let i, ii, j, jj;
  for (i = ranges.length - 1; i >= 0; --i) {
    if (ranges[i][0] <= 0xffff) {
      break;
    }
  }
  const bmpLength = i + 1;
  if (ranges[i][0] < 0xffff && ranges[i][1] === 0xffff) {
    ranges[i][1] = 0xfffe;
  }
  const trailingRangesCount = ranges[i][1] < 0xffff ? 1 : 0;
  const segCount = bmpLength + trailingRangesCount;
  const searchParams = OpenTypeFileBuilder.getSearchParams(segCount, 2);
  
  let startCount = "";
  let endCount = "";
  let idDeltas = "";
  let idRangeOffsets = "";