CppTools: Provide the editor snapshot for SemanticInfoUpdater

...so that SemanticInfoUpdater does not depend anymore on the
EditorDocumentParser. Accessing the snapshot was a blocking operation
that delayed the semantic info update longer than actually needed.

Change-Id: I348d22ef83ab310d4319b2e8b9678fe90ee24d6a
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/plugins/cpptools/cppsemanticinfo.h

@@ -48,6 +48,7 @@ public:
         const QString fileName;
         const QByteArray code;
         const unsigned revision;
+        CPlusPlus::Snapshot snapshot;
         const bool force;
 
         Source() : revision(0), force(false) {}
@@ -55,10 +56,12 @@ public:
         Source(const QString &fileName,
                const QByteArray &code,
                unsigned revision,
+               const CPlusPlus::Snapshot &snapshot,
                bool force)
             : fileName(fileName)
             , code(code)
             , revision(revision)
+            , snapshot(snapshot)
             , force(force)
         {}
     };