Alex Rickabaugh 50d4a4fe5c fix(compiler): fix a few non-tree-shakeable code patterns (#24677)
This change makes @angular/compiler more tree-shakeable by changing
an enum to a const enum and by getting rid of a top-level map that
the tree-shaker was seeing as a reference which caused r3_identifiers
to be retained.

This drops a few hundred bytes of JS from tree-shaken ngtsc compiled
apps.

PR Close #24677
2018-06-28 17:51:42 -04:00
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