* Fixes that `tsc-wrapped` stores invalid path separators in the bundled metadata files. Previous errors could have been: `Cannot find module '.corecoordinationnique-selection-dispatcher'.` (See https://github.com/angular/material2/issues/3834)
* Fixes failing tests on Windows. Now all tooling tests are green on Windows.
Related to #15403
Added an "origins" section to the flat module `.metadata.json` files
that records where the original symbols was declared. This allows
correctly calculating relative path references recorded in metadata.
