Fix Clang UBSAN failures

test/Jamfile.v2

@@ -80,13 +80,11 @@ run hash_string_test2.cpp
   /boost/utility//boost_utility ;
 
 # for gcc-4.8
-local fs-path-req = "-<toolset>gcc:<cxxflags>-Wshadow" "-<toolset>gcc:<cxxflags>-Wconversion" <toolset>gcc-4.7:<build>no ;
+local fs-path-req = <library>/boost/filesystem//boost_filesystem/<warnings>off "-<toolset>gcc:<cxxflags>-Wshadow" "-<toolset>gcc:<cxxflags>-Wconversion" <toolset>gcc-4.7:<build>no <undefined-sanitizer>norecover:<link>static ;
 
-run hash_fs_path_test.cpp /boost/filesystem//boost_filesystem/<warnings>off : : : $(fs-path-req)
-  <toolset>msvc-14.0,<cxxstd>latest:<build>no
-  <undefined-sanitizer>norecover:<link>static ;
+run hash_fs_path_test.cpp : : : $(fs-path-req) <toolset>msvc-14.0,<cxxstd>latest:<build>no ;
 
-run is_range_test2.cpp /boost/filesystem//boost_filesystem : : : $(fs-path-req) ;
+run is_range_test2.cpp : : : $(fs-path-req) ;
 
 run hash_container_test.cpp ;