Clang: Add macro names the to project part

So we can compare later if the macro names have changed.

Change-Id: I65c5f76e07fced8df6cc7282c03430adffcf5fa8
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/tools/clangrefactoringbackend/source/symbolindexer.cpp

@@ -64,7 +64,8 @@ void SymbolIndexer::updateProjectPart(V2::ProjectPartContainer &&projectPart,
                                                  m_symbolsCollector.sourceLocations());
 
     m_symbolStorage.insertOrUpdateProjectPart(projectPart.projectPartId(),
-                                              projectPart.arguments());
+                                              projectPart.arguments(),
+                                              projectPart.macroNames());
     m_symbolStorage.updateProjectPartSources(projectPart.projectPartId(),
                                              m_symbolsCollector.sourceFiles());