The modification of the TemplateNameId changed "global state" because
the TemplateNameId is potentially accessed by multiple threads doing
lookup (access to same document and thus same symbol names).
Depending on the thread scheduling and access to
ClassOrNamespace::_specializations, the changed TemplateNameId
"suddenly" led to inconsistent results of TemplateNameId::Compare and
thus broke the std::map assertions.
Get rid of the const_cast, the setter and simply construct a temporary
TemplateNameId with isSpecializaton = true.
Task-number: QTCREATORBUG-14911
Change-Id: Ie381d132cc0d06af351ace4257773637d1ebee4e
Reviewed-by: Przemyslaw Gorszkowski <pgorszkowski@gmail.com>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
624bfeb70b