[Sema] Refactor LookupVisibleDecls. NFC
Summary:
We accumulated some configuration parameters for LookupVisibleDecls that
are being passed unchanged to recursive calls, e.g. LoadExternal and
IncludeDependentBases.
At the same time, there is a bunch of parameters that can change in the
recursive invocations.
It is hard to tell the difference between those groups, making the code
hard to follow.
This change introduces a helper struct and factors out the non-changing
bits into fields, making recursive calls in the implementation code easier
to read.
Reviewers: sammccall
Reviewed By: sammccall
Subscribers: riccibruno, doug.gregor, jkorous, arphaman, kadircet, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D65752
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@371032
91177308-0d34-0410-b5e6-
96231b3b80d8
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