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The Query structure is constructed often and is relevant for compiletime performance. We can replace the SmallPtrSet for assumption exclusions in this structure with a fixed size array because we know the maximum number of elements. This improves typical clang -O3 -emit-llvm compiletime by 1.2% in my measurements. Differential Revision: http://reviews.llvm.org/D16204 llvm-svn: 259025