Get the lang from the CompileUnit for ParseCompileUnitFunctionForPDBFunc

[lanza]

Summary

Instead of assuming that the language is C++ instead check the compunit
for the language it received from the debug info.

[lanza]

land

source/Plugins/SymbolFile/PDB/SymbolFilePDB.cpp

SymbolFilePDB::ParseCompileUnitFunctionForPDBFunc(const PDBSymbolFunc &pdb_func,
   Mangled mangled = GetMangledForPDBFunc(pdb_func);
 
   FunctionSP func_sp =
       std::make_shared<Function>(&comp_unit, pdb_func.getSymIndexId(),
                                  func_type_uid, mangled, func_type, func_range);
 
   comp_unit.AddFunction(func_sp);
 
-  TypeSystem *type_system = GetTypeSystemForLanguage(lldb::eLanguageTypeC_plus_plus);
+  LanguageType lang = ParseLanguage(comp_unit);
+  TypeSystem *type_system = GetTypeSystemForLanguage(lang);
   if (!type_system)
     return nullptr;
   ClangASTContext *clang_type_system =
     llvm::dyn_cast_or_null<ClangASTContext>(type_system);
   if (!clang_type_system)
     return nullptr;
   clang_type_system->GetPDBParser()->GetDeclForSymbol(pdb_func);