This patch includes following changes:
•Add Language member to Mangled class with corresponding constructor. Minor refactoring in places where Mangled instances used.
•Function name demangling depending on its compile unit actual language - for example taking Pascal and Java namespace separator into account.
•Enable demangling for case if function/sym language still unknown at moment when demangling requested.
•Flag indicating known language was set added. Demangler now is able to re-demangle given sym name if it language was actualized since Mangled object creation. Demangling against unknown language is allowed because in lldb unknown language means C++/ObjC in most cases implicitly.