Add QEventLoop::ProcessEventsFlag::ApplicationExec

The wasm event dispatcher needs to differentiate between
top-level QCoreApplication::exec() and QEventLoop::exec()
calls.

Add the “ApplicationExec” enum value. The value is
undocumented, like EventLoopExec and DialogExec.

Change-Id: I2924daee39ef85a3ea7e766e317b3071b5d7f541

Reviewed-by: Lorn Potter <lorn.potter@gmail.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/kernel/qcoreapplication.cpp

@@ -1381,7 +1381,7 @@ int QCoreApplication::exec()
     QEventLoop eventLoop;
     self->d_func()->in_exec = true;
     self->d_func()->aboutToQuitEmitted = false;
-    int returnCode = eventLoop.exec();
+    int returnCode = eventLoop.exec(QEventLoop::ApplicationExec);
     threadData->quitNow = false;
 
     if (self)

src/corelib/kernel/qeventloop.cpp

@@ -88,6 +88,7 @@ QT_BEGIN_NAMESPACE
     \omitvalue X11ExcludeTimers
     \omitvalue EventLoopExec
     \omitvalue DialogExec
+    \omitvalue ApplicationExec
 
     \sa processEvents()
 */

src/corelib/kernel/qeventloop.h

@@ -62,7 +62,8 @@ public:
         WaitForMoreEvents = 0x04,
         X11ExcludeTimers = 0x08,
         EventLoopExec = 0x20,
-        DialogExec = 0x40
+        DialogExec = 0x40,
+        ApplicationExec = 0x80,
     };
     Q_DECLARE_FLAGS(ProcessEventsFlags, ProcessEventsFlag)