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Common::unordered_map/set defaulted to std::hash, a byte-wise FNV-1a on MSVC for
integers and pointers, which boost's flat containers then mix again: the GPU thread's
page maps (shader and query cache invalidation, per inline upload) spent ~1% in it.
Integer and pointer keys now go through as they are and boost mixes them.
BufferCache::IsRegionGpuModified visited every GPU-written range inside the query just
to answer yes or no; without per-fence downloads those ranges stay fragmented and it was
~4% of title 1's GPU thread (inline uploads). RangeSet::Intersects answers with one
lookup. Inline uploads: 10.5% -> 7.5% of the GPU thread.
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