Add test cases to TestThreadAPI.py to exercise SBThread.StepOver() by stopping at a breakpoint,

doing three step-over's, then verifying that the correct source line number is reached.

llvm-svn: 127432

lldb/test/python_api/thread/main2.cpp

@@ -31,7 +31,7 @@ int b(int val)
         return -1;
     else
         printf("ptr=%p\n", ptr);
-    return rc;
+    return rc;                // we should reach here after 3 step-over's.
 }
 
 int c(int val)