Added suppression entries for determining if TObject on heap

To determine if TObject is on the heap we read the value of a member
data before it has been set by the constructor. If it was heap
allocated the TObject::operator new will have filled special values
into the memory area. However, for stack allocated it is
unset. This makes valgrind report an error. Given we intend this
behavior, we suppress the message.

etc/valgrind-root.supp

@@ -482,6 +482,29 @@
    fun:_ZL20G__cpp_setup_global0v
 }
 
+######## ROOT TObject on heap
+
+{
+   TObject::TObject() uses uninitialized value
+   Memcheck:Cond
+   fun:_ZN7TObjectC1Ev
+   ...
+}
+
+{
+   TObject::TObject(const TObject&) uses uninitialized value
+   Memcheck:Cond
+   fun:_ZN7TObjectC1ERKS_
+   ...
+}
+
+{
+   gcc optimizer confuses valgrind on TObject::~TObject()
+   Memcheck:Cond
+   fun:_ZN7TObjectD1Ev
+   ...
+}
+
 ######### Misc
 
 {