Commits on Feb 25, 2021

1. [DEPRECATE] registerPlugin / unregisterPlugin and legacy class ba… …

   …sed AST plugins
   
   The usage of `registerPlugin`/`unregisterPlugin` **requires** global
   state mutation which leaks AST plugins between addon's and applications.
   Tools like Embroider and ember-cli-htmlbars have avoided this by
   ensuring that we purge the Node module caching system between each
   attempt at using the template compiler. This results in _massive_ memory
   growth (the entire `ember-template-compiler.js` source string is
   included in memory for each addon in the build, as well as any JIT
   artificats).
   
   This is **very _bad_**.
   
   This PR deprecates using `registerPlugin`/`unregisterPlugin` along with
   the legacy AST transform API. All of these APIs are private APIs (as is
   anything to do with the template compilation AST), but they are used
   fairly often so a proper deprecation cycle is useful.

   

   rwjblue committed Feb 25, 2021
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