Remove the isRef helper function

[Snuffleupagus]

This helper function is not really needed, since it's just a wrapper around a simple instanceof check, and it only adds unnecessary indirection in the code.

[Snuffleupagus]

/botio test

[pdfjsbot]

From: Bot.io (Linux m4)

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Received

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

Live output at: http://54.241.84.105:8877/0d2dcc1f8e392c6/output.txt

[pdfjsbot]

From: Bot.io (Windows)

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Received

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

Live output at: http://54.193.163.58:8877/9cc9e4c8046e081/output.txt

[pdfjsbot]

From: Bot.io (Linux m4)

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Failed

Full output at http://54.241.84.105:8877/0d2dcc1f8e392c6/output.txt

Total script time: 23.15 mins

• Font tests: Passed
• Unit tests: Passed
• Integration Tests: Passed
• Regression tests: FAILED

  different ref/snapshot: 7
  different first/second rendering: 2

Image differences available at: http://54.241.84.105:8877/0d2dcc1f8e392c6/reftest-analyzer.html#web=eq.log

[pdfjsbot]

From: Bot.io (Windows)

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Failed

Full output at http://54.193.163.58:8877/9cc9e4c8046e081/output.txt

Total script time: 25.20 mins

• Font tests: Passed
• Unit tests: Passed
• Integration Tests: Passed
• Regression tests: FAILED

  different ref/snapshot: 7

Image differences available at: http://54.193.163.58:8877/9cc9e4c8046e081/reftest-analyzer.html#web=eq.log

[timvandermeij]

r=me with a rebase since the first commit was already part of another PR; thanks!

[Snuffleupagus]

/botio unittest

[pdfjsbot]

From: Bot.io (Linux m4)

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Received

Command cmd_unittest from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.241.84.105:8877/24adfe6a1a8c057/output.txt

[pdfjsbot]

From: Bot.io (Windows)

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Received

Command cmd_unittest from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.193.163.58:8877/529794ecf5382ad/output.txt

[pdfjsbot]

From: Bot.io (Linux m4)

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Success

Full output at http://54.241.84.105:8877/24adfe6a1a8c057/output.txt

Total script time: 3.10 mins

• Unit Tests: Passed

[pdfjsbot]

From: Bot.io (Windows)

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Success

Full output at http://54.193.163.58:8877/529794ecf5382ad/output.txt

Total script time: 6.80 mins

• Unit Tests: Passed