Backport: Use _private instead of #private properties
#1355
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The updates to the template compiler made in support of strict mode introduced a number of uses of private class fields, some of them in hot paths. Although all supported versions of Node support private class fields, `tsc` transpiles private class fields to `WeakMap`s for all values of `target` lower than `ESNEXT`. As a result, the use of private class fields results in dramatically higher memory usage and garbage collection than in the previous version of the template compiler. This in turn causes at least a large portion of the regression noted in [emberjs/ember.js#19750][1]. [1]: emberjs/ember.js#19750 Here, we replace *all* private class fields with `_` private fields, which substantially (thought not 100%) closed the gap with the original. Co-authored-by: Brenden Palmer <brendenpalmer@gmail.com>
chriskrycho
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_private instead of #private properties_private instead of #private properties
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Backport for #1335.