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6d2b59a58f
an entry in the nonlocal deps map, don't reset entries referencing that instruction to [dirty, null], instead, set them to [dirty,next] where next is the instruction after the deleted one. Use this information in the non-local deps code to avoid rescanning entire blocks. This speeds up GVN slightly by avoiding pointless work. On 403.gcc this makes GVN 1.5% faster. llvm-svn: 60256