Qt5: Don't use the deprecated {QString,QChar}::fromAscii()

Change-Id: Ic1d302c2186b11ffec5139f4f491d477d334ec8f
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/libs/cplusplus/LookupContext.cpp

@@ -594,7 +594,7 @@ void CreateBindings::lookupInScope(const Name *name, Scope *scope,
 #ifdef DEBUG_LOOKUP
             Overview oo;
             qDebug() << "Found" << id->chars() << "in"
-                     << (binding ? oo(binding->_name) : QString::fromAscii("<null>"));
+                     << (binding ? oo(binding->_name) : QString::fromLatin1("<null>"));
 #endif // DEBUG_LOOKUP
 
             LookupItem item;

src/plugins/debugger/qml/qmlv8debuggerclient.cpp

@@ -1766,7 +1766,7 @@ QmlJS::ConsoleItem *constructLogItemTree(QmlJS::ConsoleItem *parent,
     if (objectData.name.isEmpty())
         text = objectData.value.toString();
     else
-        text = QString(_("%1: %2")).arg(QString::fromAscii(objectData.name))
+        text = QString(_("%1: %2")).arg(QString::fromLatin1(objectData.name))
                 .arg(objectData.value.toString());
 
     ConsoleItem *item = new ConsoleItem(parent, ConsoleItem::UndefinedType, text);

src/plugins/fakevim/fakevimhandler.cpp

@@ -848,7 +848,7 @@ public:
 
         // Set text only if input is ascii key without control modifier.
         if (m_text.isEmpty() && k <= 0x7f && (m & (HostOsInfo::controlModifier())) == 0) {
-            QChar c = QChar::fromAscii(k);
+            QChar c = QChar::fromLatin1(k);
             m_text = QString((m & ShiftModifier) != 0 ? c.toUpper() : c.toLower());
         }