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Previously we were assuming that any visitation of types would necessarily be against a type we had binary data for. Reasonable assumption when were just reading PDBs and dumping them, but once we start writing PDBs from Yaml this breaks down, because we have no binary data yet, only Yaml, and from that we need to read the record kind and perform the switch based on that. So this patch does that. Instead of having the visitor switch on the kind that is already in the CVType record, we change the visitTypeBegin() method to return the Kind, and switch on the returned value. This way, the default implementation can still return the value from the CVType, but the implementation which visits Yaml records and serializes binary PDB type records can use the field in the Yaml as the source of the switch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280307 91177308-0d34-0410-b5e6-96231b3b80d8
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