Make QmlJS::Link private. Use Context::build to set up a context.

src/libs/qmljs/qmljsinterpreter.cpp

@@ -29,6 +29,7 @@
 
 #include "qmljsinterpreter.h"
 #include "qmljscheck.h"
+#include "qmljslink.h"
 #include "parser/qmljsast_p.h"
 #include <QtCore/QMetaObject>
 #include <QtCore/QMetaProperty>
@@ -688,6 +689,12 @@ Context::~Context()
 {
 }
 
+void Context::build(AST::Node *node, Document::Ptr doc, const Snapshot &snapshot)
+{
+    Link link(this, doc, snapshot);
+    link.scopeChainAt(doc, node);
+}
+
 Engine *Context::engine() const
 {
     return _engine;