The Annotations helper class does not have a gtest or gmock dependency, but because it's bundled with the rest of TestingSupport, it gets one. By splitting it out, a target can use it without being forced to use LLVM's copy of gtest.
Reviewed By: GMNGeoffrey, sammccall, gribozavr2
Differential Revision: https://reviews.llvm.org/D141175
ASTMatchers are pulling in lots of dependencies that we don't really
need for just finding a decl based on name. So use a simple RAV instead.
Differential Revision: https://reviews.llvm.org/D139093
Creates a one to many mapping, by returning all the possible locations
providing a symbol. Also includes an "is definition" signal for the
location, that can be used for ranking afterwards.
This also takes care of stdlib symbols by having a variant of locations.
Depends on D135859.
Differential Revision: https://reviews.llvm.org/D135953
