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Benjamin Kramer
4861bbca65
Lazily allocate DenseMaps.
This makes lookup slightly more expensive but it's worth it, unused DenseMaps are common in LLVM code apparently. 1% speedup on clang -O3 bzip2.c 4% speedup on clang -O3 oggenc.c (Release build of clang on i386/linux) llvm-svn: 127088
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