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Previously, every time we wanted to serialize a field list record, we would create a new copy of FieldListRecordBuilder, which would in turn create a temporary instance of TypeSerializer, which itself had a std::vector<> that was about 128K in size. So this 128K allocation was happening every time. We can re-use the same instance over and over, we just have to clear its internal hash table and seen records list between each run. This saves us from the constant re-allocations. This is worth an ~18.5% speed increase (3.75s -> 3.05s) in my tests. Differential Revision: https://reviews.llvm.org/D33506 llvm-svn: 303919
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