[llvm-dev] Trying to use unordered_map

[Paul C. Anagnostopoulos via llvm-dev]

I implemented a map for Record fields using StringMap. The map is created when the backend does a getAllDerivedDefinitions(), under the assumption that it will then access the values from the returned vector of Record's.

This resulted in a noticeable slowdown of the backends, on the order of 10%. The time to construct the maps appears to overwhelm any savings in accessing the field values. 

I'm going to try some other tricks, but I think this is a dead end.