[cfe-dev] Diagnosing alternative operator spellings & digraphs from a plugin

[Jacob Bandes-Storch via cfe-dev]

I'm interested in writing a plugin to disallow alternative spelling
<https://en.cppreference.com/w/cpp/language/operator_alternative>/digraphs for
operators and tokens. However I haven't been able to find a way to access
this information from a PluginASTAction.

I see that the digraphs (<: %: etc.) are handled in Lexer.cpp, but perhaps
the only way to get the original spelling is Lexer::getSpelling(). Would I
be able to get access to the Lexer, SourceLocation, SourceManager, etc.
from a PluginASTAction in order to call this?

I also found the `CXX_KEYWORD_OPERATOR`s in TokenKinds.def, but it looks
like these get mapped to the same token kinds as the regular operator
spellings so I'm not sure how to distinguish them after the AST is built.

Any recommendations would be appreciated, thanks!
Jacob
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