Make pnacl-bccompress add abbreviations for obvious constants.

include/llvm/Bitcode/NaCl/NaClBitcodeAbbrevDist.h

 //===-- NaClBitcodeAbbrevDist.h ---------------------------------------------===//
 //      Defines distribution maps for abbreviations associated with
 //      bitcode records.
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
@@ skipping 47 matching lines @@
 
   virtual const char *GetValueHeader() const;
 
   virtual void PrintRowValue(raw_ostream &Stream,
                              NaClBitcodeDistValue Value,
                              const NaClBitcodeDist *Distribution) const;
 
   virtual const SmallVectorImpl<NaClBitcodeDist*> *
   GetNestedDistributions() const;
 
-  NaClBitcodeDist *GetCodeDist() {
-    return &CodeDist;
+  NaClBitcodeDist &GetCodeDist() {
+    return CodeDist;
   }
 
 private:
   // The block id associated with the abbreviation.
   unsigned BlockID;
 
   // Nested blocks used by GetNestedDistributions.
   SmallVector<NaClBitcodeDist*, 1> NestedDists;
 
   /// The records associated with the given abbreviation.
@@ skipping 34 matching lines @@
 
 private:
   // The block id associated with the abbreviations in this
   // distribution map.
   unsigned BlockID;
 };
 
 }
 
 #endif