JoostK a529d4f4f8 fix(core): do not retain dynamically compiled components and modules (#42003)
The JIT compiler has a mapping from component to the owning NgModule
and tracks whether a certain NgModule class has been verified; these
maps causes any JIT compiled component and NgModule to be retained even
if they are no longer referenced from anywhere else. This commit
switches the maps to `WeakMap` to allow garbage collecting any
components and NgModules that are no longer referenced elsewhere.

Fixes #19997

PR Close #42003
2021-05-10 10:36:21 -04:00
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