[cfe-dev] Name lookup approach

[Zhongxing Xu]

Hi,

Currently we have two mechanisms to do name lookup: IdentifierResolver and
DeclContext. In Sema::LookupDecl(), we combine the two approaches to fulfil
the name lookup task. I really feel that the code in Sema::LookupDecl()
logically uninituitive and error prone. Could we use DeclContext exclusively
to do name lookup and eliminate the IdentifierResolver use? I think that way
could make name lookup logically more clear. My only concern is if that
could cause performance lost?

-Zhongxing
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