Check if the target of a using decl is already declared in this scope before
doing any of the other redeclaration checks.  We were missing a few cases.
Fixes PR 5752.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@91096 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed