Update text layer correctly when zooming with USE_ONLY_CSS_ZOOM
Merge pull request #4797 from yurydelendik/issue4634

Update text layer correctly when zooming with USE_ONLY_CSS_ZOOM
Optimized function.js / 2x Faster PDFFunction_constructPostScriptFromIR
Optimized colorspace.js AlternateCS_getRgbBuffer
Optimized stream.js / 9-10x faster DecodeStream_ensureBuffer