Early evaluate line loc in NameAndLoc::operator==

I do not know if checking the tracker name or the tracker's file
part of the location first would provide better results, but
in the common case, the line part of the location check should be
rather unique, because different `SECTION`s will have different
source lines where they are defined.

I also propagated this same check into `ITracker::findChild`,
because this significantly improves performance of section tracking
in Debug builds -> 10% in macro benchmark heavily focused on section
tracking. In Release build there is usually no difference, because
the inliner will inline `NameAndLoc::operator==` into `findChild`,
and then eliminate the redundant check. (If the inliner decides
against, then this still improves the performance on average).

src/catch2/internal/catch_test_case_tracker.cpp

@@ -43,7 +43,12 @@ namespace TestCaseTracking {
             m_children.begin(),
             m_children.end(),
             [&nameAndLocation]( ITrackerPtr const& tracker ) {
-                return tracker->nameAndLocation() == nameAndLocation;
+                auto const& tnameAndLoc = tracker->nameAndLocation();
+                if ( tnameAndLoc.location.line !=
+                     nameAndLocation.location.line ) {
+                    return false;
+                }
+                return tnameAndLoc == nameAndLocation;
             } );
         return ( it != m_children.end() ) ? it->get() : nullptr;
     }