* [tests] Add 'link all' test for XM.
* [tests] Add 'link sdk' test for XM.
* [tests] Move dontlink-mac tests to linker-mac directory to have the same directory layout as linker-ios.
* [tests] Add support for passing arguments to XM unit tests from the command line.
* [xharness] Get xml results for mac unit tests and parse it to show failures inline in the html report.
Those tests needs to be run with the linker disabled since they use
reflection for most of their work.
The original dontlink (for linker tests) was becoming too large in
some configuration (e.g. tvOS release with bitcode) but this was
due to other BCL assemblies (not the introspection tests)
Rolf Bjarne Kvinge
Chris Hamons
Timothy Risi
Sebastien Pouliot