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Commit a5acaa3c authored by Daniel Dunbar's avatar Daniel Dunbar
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ASTWriter: Cache some DenseMaps we use repeatedly. 

 - This reduces our total # of allocations building a PCH for Cocoa.h by almost
   a whopping 50%.
 - A SmallPtrMap would be cleaner, but since we don't have one yet...

llvm-svn: 151697
parent 7e4b976c
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