[build-script] On buildbots, pass in the -v command into lit instead of -sv.
This enables you to know what tests actually ran instead of just the number of
tests that ran. This helps identify:
1. Tests that are not running, but /should/ be running.
2. Tests that are XFAILED or DISABLED but should not be.
swift
7aaa5651 - [build-script] On buildbots, pass in the -v command into lit instead of -sv.
