Holly Borla 393b4ceb95 [NameLookup] Move macro-related name lookup operations into the namelookup ...

namespace.

This moves the `isInMacroArgument` predicate and `lookupMacros` into `namelookup`.
ASTScope still encapsulates the scope tree and contains the operation to lookup
the enclosing macro scope, which then invokes a callback to determine whether a
potential macro scope is indeed a macro, because answering this question requires
name lookup.

2023-06-11 23:10:43 -07:00

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