Make pnacl-bccompress add abbreviations for obvious constants.

lib/Bitcode/NaCl/Reader/NaClBitcodeDist.cpp

 //===- NaClBitcodeDist.cpp --------------------------------------*- C++ -*-===//
 //     Internal implementation of PNaCl bitcode distributions.
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
@@ skipping 42 matching lines @@
     return;
   RemoveCachedDistribution();
   ++Total;
   unsigned BlockID = Block.GetBlockID();
   NaClBitcodeDistElement *Element = GetElement(BlockID);
   Element->AddBlock(Block);
 }
 
 void NaClBitcodeDist::Print(raw_ostream &Stream,
                             const std::string &Indent) const {
-  Distribution *Dist = GetDistribution();
+  const Distribution *Dist = GetDistribution();
   Stream << Indent;
   Sentinel->PrintTitle(Stream, this);
   Stream << Indent;
   Sentinel->PrintHeader(Stream);
   Stream << "\n";
   bool NeedsHeader = false;
   for (size_t I = 0, E = Dist->size(); I < E; ++I) {
     if (NeedsHeader) {
       // Reprint the header so that rows are more readable.
       Stream << Indent << "  " << Sentinel->GetTitle() << " (continued)\n";
@@ skipping 121 matching lines @@
           PrintedNestedDists = true;
           Stream << "\n";
         }
         Dist->Print(Stream, Indent + "    ");
         Stream << "\n";
       }
     }
   }
   return PrintedNestedDists;
 }