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773ad55a39
When using FileIndexRecord with macros, symbol references can be seen out of source order, which was causing a regression to insert the symbols into a vector. Instead, we now lazily sort the vector. The impact is small on most code, but in very large files with many macro references (M) near the beginning of the file followed by many decl references (D) it was O(M*D). A particularly bad protobuf-generated header was observed with a 100% regression in practice. rdar://78628133