Clang: Introduce OverviewModel for clang

Change-Id: I1473e3f679f4345a04c55f1ee80cfe35e21a4347
Reviewed-by: Marco Bubke <marco.bubke@qt.io>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/clangcodemodel/clangcodemodel.pro

@@ -40,7 +40,8 @@ SOURCES += \
     clangrefactoringengine.cpp \
     clangtextmark.cpp \
     clanguiheaderondiskmanager.cpp \
-    clangutils.cpp
+    clangutils.cpp \
+    clangoverviewmodel.cpp
 
 HEADERS += \
     clangactivationsequencecontextprocessor.h \
@@ -79,7 +80,8 @@ HEADERS += \
     clangrefactoringengine.h \
     clangtextmark.h \
     clanguiheaderondiskmanager.h \
-    clangutils.h
+    clangutils.h \
+    clangoverviewmodel.h
 
 FORMS += clangprojectsettingswidget.ui