[Parser] Remove custom diagnostic that relies on AST-level name lookup. #18470
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The parser was using an AST-level name lookup operation to provide a slightly improved diagnostic (suggesting "self." if there was a member of that name in the enclosing type context). This is a fairly unfortunate layering violation: name lookup cannot produce correct results at this point. Remove the custom diagnostic and the lookup; this can come back when all lookup moves out of the parser.
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The parser was using an AST-level name lookup operation to provide a
slightly improved diagnostic (suggesting "self." if there was a member
of that name in the enclosing type context). This is a fairly unfortunate
layering violation: name lookup cannot produce correct results at this
point. Remove the custom diagnostic and the lookup; this can come back
when all lookup moves out of the parser.