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 glyphProfile = sanitizeGlyph(
          oldGlyfData,
          locaEntries[i].offset,
          locaEntries[i].endOffset,
          newGlyfData,
          writeOffset,
          hintsValid
        );
        const newLength = glyphProfile.length;
        if (newLength === 0) {
          missingGlyphs[i] = true;
        }
        if (glyphProfile.sizeOfInstructions > maxSizeOfInstructions) {
          maxSizeOfInstructions = glyphProfile.sizeOfInstructions;
        }
        writeOffset += newLength;
        itemEncode(locaData, j, writeOffset);
      }
      if (writeOffset === 0) {
        
        
        const simpleGlyph = new Uint8Array([
          0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 49, 0,
        ]);
        for (i = 0, j = itemSize; i < numGlyphsOut; i++, j += itemSize) {
          itemEncode(locaData, j, simpleGlyph.length);
        }
        glyf.data = simpleGlyph;
      } else if (dupFirstEntry) {