C++: Print numeric template arguments in NamePrettyPrinter

Improve type printed for template specializations with numeric
or bool values.

Code example:
template<bool B, class T> struct enable_if{};
template<class T> struct enable_if<true, T>{ typedef T type; };

In outline: "enable_if<_Tp1, T> <T>" becomes "enable_if<true, T> <T>"

TemplateArgument class holds pointer to numeric literal owned
by CppDocument, so remove Control::squeeze() to not release
numericLiterals in CppDocument::releaseSourceAndAST()

This based on TemplateArgument class introduced in commit
9ee693ee22

Change-Id: Ib787a5e402c3e8d8467b520347a26afa6087d4bd
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/libs/3rdparty/cplusplus/Control.cpp

@@ -821,11 +821,6 @@ bool Control::hasSymbol(Symbol *symbol) const
     return std::find(d->symbols.begin(), d->symbols.end(), symbol) != d->symbols.end();
 }
 
-void Control::squeeze()
-{
-    d->numericLiterals.reset();
-}
-
 TopLevelDeclarationProcessor *Control::topLevelDeclarationProcessor() const
 {
     return d->processor;

src/libs/3rdparty/cplusplus/Control.h

@@ -217,8 +217,6 @@ public:
     bool hasSymbol(Symbol *symbol) const;
     void addSymbol(Symbol *symbol);
 
-    void squeeze();
-
 private:
     class Data;
     friend class Data;

src/libs/cplusplus/CppDocument.cpp

@@ -711,8 +711,6 @@ void Document::releaseSourceAndAST()
     if (!_keepSourceAndASTCount.deref()) {
         _source.clear();
         _translationUnit->release();
-        if (_control)
-            _control->squeeze();
     }
 }
 

src/libs/cplusplus/NamePrettyPrinter.cpp

@@ -80,8 +80,13 @@ void NamePrettyPrinter::visit(const TemplateNameId *name)
         if (index != 0)
             _name += QLatin1String(", ");
 
-        FullySpecifiedType argTy = name->templateArgumentAt(index).type();
+        TemplateArgument templArg = name->templateArgumentAt(index);
-        QString arg = overview()->prettyType(argTy);
+        QString arg;
+        if (templArg.type().isValid())
+            arg = overview()->prettyType(templArg.type());
+        else if (const NumericLiteral *num = templArg.numericLiteral())
+            arg = QString::fromLatin1(num->chars(), num->size());
+
         if (arg.isEmpty())
             _name += QString::fromLatin1("_Tp%1").arg(index + 1);
         else