desrosj e96048d2f0 Twenty Twenty-One: Only load IE specific polyfills when actually using Internet Exploreer.
The `twenty-twenty-one-ie11-polyfills` script now has a `null` source, and the new `twenty-twenty-one-ie11-polyfills-asset` (which points to the actual `polyfills.js` source) will be loaded only if IE is detected by through the use of `wp_get_script_polyfill()`.

Because the original script name remains the same, this change is backwards compatible with any code registering `twenty-twenty-one-id11-polyfills` as a script dependency.

Props poena, ismail.elkorchi, peterwilsoncc.
Merges [49865] to the 5.6 branch.
Fixes #52098.
Built from https://develop.svn.wordpress.org/branches/5.6@49868


git-svn-id: http://core.svn.wordpress.org/branches/5.6@49587 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-12-22 16:19:08 +00:00
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