[PATCH] Sema: Fix some undefined behaviour when acting on redeclarations

[Justin Bogner]

If we hit an error already, we may have set Name to nullptr, which
means calling isAcceptableTagRedeclaration hits UB. Avoid this like we
do elsewhere in the function by checking Name first.

We could also fix this by passing OrigName instead, since the name is
only used for diagnostics anyway. Should I do that instead, or is this
good to commit?

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