Fix line number reporting in scripts when lookups are enabled

For regular object property lookups, we correctly store the byte code
instruction pointer that allows us to determine the correct line number
in case of a reference error. We need to do the same for lookups in the
global object.

Change-Id: I0f44dd06b5f66df9626576eeaa802b18fa4a26cd
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

src/qml/jsruntime/qv4vme_moth.cpp

@@ -550,6 +550,7 @@ QV4::ReturnedValue VME::interpret(CppStackFrame *frame, ExecutionEngine *engine,
     MOTH_END_INSTR(LoadName)
 
     MOTH_BEGIN_INSTR(LoadGlobalLookup)
+        STORE_IP();
         QV4::Lookup *l = function->compilationUnit->runtimeLookups + index;
         acc = l->globalGetter(l, engine);
         CHECK_EXCEPTION;