Move compressor out of the core Reader.cpp file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34007 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Bytecode/Reader/Reader.h

@@ -140,12 +140,16 @@ public:
 /// @name Methods
 /// @{
 public:
+    
+  typedef size_t Decompressor_t(const char *, size_t, char*&, std::string*);
+  
   /// @returns true if an error occurred
   /// @brief Main interface to parsing a bytecode buffer.
   bool ParseBytecode(
      volatile BufPtr Buf,         ///< Beginning of the bytecode buffer
      unsigned Length,             ///< Length of the bytecode buffer
      const std::string &ModuleID, ///< An identifier for the module constructed.
+     Decompressor_t *Decompressor = 0, ///< Optional decompressor.
      std::string* ErrMsg = 0      ///< Optional place for error message 
   );