lit: Add --repeat=N option, for running each test N times.
 - Currently just useful for timing, although it could be extended as one (bad) way to deal with flaky tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@88827 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/CommandGuide/lit.pod b/docs/CommandGuide/lit.pod
index 1650742..246fc66 100644
--- a/docs/CommandGuide/lit.pod
+++ b/docs/CommandGuide/lit.pod
@@ -149,6 +149,11 @@
 
 Run Tcl scripts internally (instead of converting to shell scripts).
 
+=item B<--repeat>=I<N>
+
+Run each test I<N> times. Currently this is primarily useful for timing tests,
+other results are not collated in any reasonable fashion.
+
 =back
 
 =head1 EXIT STATUS