Pete Bacon Darwin e526f74dfd refactor(compiler): create a new root BindingScope for each template (#36362)
Previously we had a singleton `ROOT_SCOPE` object, from
which all `BindingScope`s derived. But this caused ngcc to
produce non-deterministic output when running multiple workers
in parallel, since each process had its own `ROOT_SCOPE`.

In reality there is no need for `BindingScope` reference names
to be unique across an entire application (or in the case of ngcc
across all the libraries). Instead we just need uniqueness within
a template.

This commit changes the compiler to create a new root `BindingScope`
each time it compiles a component's template.

Resolves #35180

PR Close #36362
2020-04-09 09:44:56 -07:00
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