8cd33751c6
String concat now uses + rather than tagged template strings. Also refactors the JSTypeRep code into a shared location, and fixes a bug in null inference for op assign expressions in Analyzer backend. Change-Id: I74fb6950c1d739efb977a03bd639a07afe453eb6 Reviewed-on: https://dart-review.googlesource.com/57522 Commit-Queue: Jenny Messerly <jmesserly@google.com> Reviewed-by: Vijay Menon <vsm@google.com>