1af1d868bd
Speeds up analysis by about 8%. Note: the interning table uses both the file path and the URI to distinguish FileBasedSource objects. This should eliminate the strange behaviors we would see in the rare case where a single URI would get associated with multiple file paths (see dartbug.com/22555). The interning table is never flushed over the lifetime of the application. In practice this should not be a problem, because it only contains one entry per filename/URI, and the total number of filenames/URIs analyzed during the course of execution should always be small. R=brianwilkerson@google.com Review URL: https://codereview.chromium.org//954063002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44026 260f80e4-7a28-3924-810f-c04153c831b5