lit: Show actually created count of threads. The incorrect threads count is printed if the number of tests are less than the number of default threads.
lit: Show actually created count of threads. The incorrect threads count is printed if the number of tests are less than the number of default threads.

Thanks to Vinson Lee, reported in PR13620.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@162078 91177308-0d34-0410-b5e6-96231b3b80d8

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