QTypeInfo: fix pointer detection

Although redudant, people are allowed to use Q_DECLARE_TYPEINFO on a pointer
type. There's no reason to mis-detect the isPointer trait in that case.

Change-Id: Ic116f24397c91f5a3d31f5d8ee9fa2e587823257
Pick-to: 5.15 6.2 6.4 6.5
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

src/corelib/global/qtypeinfo.h

@@ -143,7 +143,7 @@ public: \
     enum { \
         isComplex = (((FLAGS) & Q_PRIMITIVE_TYPE) == 0) && !std::is_trivial_v<TYPE>, \
         isRelocatable = !isComplex || ((FLAGS) & Q_RELOCATABLE_TYPE) || qIsRelocatable<TYPE>, \
-        isPointer = false, \
+        isPointer = std::is_pointer_v< TYPE >, \
         isIntegral = std::is_integral< TYPE >::value, \
         isValueInitializationBitwiseZero = qIsValueInitializationBitwiseZero<TYPE>, \
     }; \