As of: https://github.com/D-Programming-GDC/GDC/commit/af5a89409453006fb8e85be0a18d5eeecb950fb2

The D2 testsuite passes on x86/x86_64.   This should be kept as 100% for any future pull requests and commits.

Anyone interested in improving GDC, please note the cases where tests are commented out and get fixing. :-)