[cfe-commits] PATCH: Change PPCallbacks to use Token more often

[Craig Silverstein]

Several PPCallbacks take an SourceLocation + IdentifierInfo, rather
than a Token that holds the same information all in one easy-to-use
package.  There's no technical reason to prefer the former -- the
information comes from a Token originally -- and it's clumsier to use,
so I've changed the code to use tokens everywhere.

Look ok to commit?

craig
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