Add polyfill for lit 2

[cdrini]

Some of the packages we import are already on lit 2, and need this special polyfill file.

CC @iisa

[codecov[bot]]

Codecov Report

Merging #920 (cb428eb) into master (64c1eb8) will not change coverage. The diff coverage is n/a.

:exclamation: Current head cb428eb differs from pull request most recent head d2e21de. Consider uploading reports for the commit d2e21de to get more accurate results

@@           Coverage Diff           @@
##           master     #920   +/-   ##
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  Coverage   69.30%   69.30%           
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  Files          58       58           
  Lines        5151     5151           
  Branches      846      846           
=======================================
  Hits         3570     3570           
  Misses       1569     1569           
  Partials       12       12           

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