Avoid more allocations for RTL text in bidi.js

[Snuffleupagus]

Instead of building the resulting string char-by-char for RTL text, which is inefficient, we can just as well join the chars array.

[CodingFabian]

looks good to me, +1 for merging

[timvandermeij]

/botio-linux preview

[pdfjsbot]

From: Bot.io (Linux)

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Command cmd_preview from @timvandermeij received. Current queue size: 0

Live output at: http://107.21.233.14:8877/f5d19e23e16843c/output.txt

[pdfjsbot]

From: Bot.io (Linux)

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Success

Full output at http://107.21.233.14:8877/f5d19e23e16843c/output.txt

Total script time: 0.69 mins

Published

• Viewer: http://107.21.233.14:8877/f5d19e23e16843c/web/viewer.html
• B2G Viewer: http://107.21.233.14:8877/f5d19e23e16843c/extensions/b2g/content/web/viewer.html
• Extension: http://107.21.233.14:8877/f5d19e23e16843c/extensions/firefox/pdf.js.xpi

[timvandermeij]

/botio test

[pdfjsbot]

From: Bot.io (Windows)

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Command cmd_test from @timvandermeij received. Current queue size: 0

Live output at: http://107.22.172.223:8877/fa847ab699b9cdc/output.txt

[pdfjsbot]

From: Bot.io (Linux)

---

Received

Command cmd_test from @timvandermeij received. Current queue size: 0

Live output at: http://107.21.233.14:8877/028e1cb6400c91b/output.txt

[pdfjsbot]

From: Bot.io (Windows)

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Success

Full output at http://107.22.172.223:8877/fa847ab699b9cdc/output.txt

Total script time: 18.66 mins

• Font tests: Passed
• Unit tests: Passed
• Regression tests: Passed

[pdfjsbot]

From: Bot.io (Linux)

---

Success

Full output at http://107.21.233.14:8877/028e1cb6400c91b/output.txt

Total script time: 19.54 mins

• Font tests: Passed
• Unit tests: Passed
• Regression tests: Passed

[timvandermeij]

Nice one, thank you!