TOT broken by R220956

[sbest]

Summary

R220956 broke lldb TOT. In the file clang/include/clang/AST/Decl.h, there were some typedef's inside VarDecl, FunctionDecl classes mapping clang::StorageClass to StorageClass. R220956 removed these typedefs.

In ClangASTContext.cpp, there were a few places using the old typedefs so I switched to use properly scoped name.

source/Symbol/ClangASTContext.cpp

                                           DeclarationName (&ast->Idents.get(name)),
                                           function_clang_type.GetQualType(),
                                           nullptr,
-                                          (FunctionDecl::StorageClass)storage,
+                                          (clang::StorageClass)storage,
                                           is_inline,
                                           hasWrittenPrototype,
                                           isConstexprSpecified);

                                           DeclarationName (),
                                           function_clang_type.GetQualType(),
                                           nullptr,
-                                          (FunctionDecl::StorageClass)storage,
+                                          (clang::StorageClass)storage,
                                           is_inline,
                                           hasWrittenPrototype,
                                           isConstexprSpecified);

                                 name && name[0] ? &ast->Idents.get(name) : nullptr,
                                 param_type.GetQualType(),
                                 nullptr,
-                                (VarDecl::StorageClass)storage,
+                                (clang::StorageClass)storage,
                                 nullptr);
 }