Tests: Remove regression_ prefix from test names

test/support/Jamfile

@@ -50,12 +50,12 @@ rule compile-fail ( sources + : requirements * : target-name ? )
 
 run char_encoding.cpp ;
 run istream_iterator_basic.cpp ;
+run line_pos_iterator.cpp ;
+run multi_pass_error_handler.cpp ;
+run multi_pass_parse.cpp ;
 run unused_type.cpp ;
 run utree.cpp ;
 run utree_debug.cpp ;
 
-compile regression_multi_pass_functor.cpp ;
-compile regression_multi_pass_position_iterator.cpp ;
-run regression_multi_pass_error_handler.cpp ;
-run regression_multi_pass_parse.cpp ;
-run regression_line_pos_iterator.cpp ;
+compile multi_pass_functor.cpp ;
+compile multi_pass_position_iterator.cpp ;