Avoid copying NameAndLocationRef when passed as argument

`NameAndLocationRef` is pretty large type, so even in release build,
it is unlikely to be passed in registers. In addition to the fact
that some platforms currently do not allow passing even small types
in register (Windows ABI!!), it is better to pass it as a ref,
effectively passing around a pointer.

src/catch2/internal/catch_test_case_tracker.cpp

@@ -38,7 +38,7 @@ namespace TestCaseTracking {
         m_children.push_back( CATCH_MOVE(child) );
     }
 
-    ITracker* ITracker::findChild( NameAndLocationRef nameAndLocation ) {
+    ITracker* ITracker::findChild( NameAndLocationRef const& nameAndLocation ) {
         auto it = std::find_if(
             m_children.begin(),
             m_children.end(),
@@ -177,7 +177,7 @@ namespace TestCaseTracking {
 
     bool SectionTracker::isSectionTracker() const { return true; }
 
-    SectionTracker& SectionTracker::acquire( TrackerContext& ctx, NameAndLocationRef nameAndLocation ) {
+    SectionTracker& SectionTracker::acquire( TrackerContext& ctx, NameAndLocationRef const& nameAndLocation ) {
         SectionTracker* tracker;
 
         ITracker& currentTracker = ctx.currentTracker();