push bytecode decompressor out through APIs.  Now the bytecode reader
api's look like this:

ModuleProvider *getBytecodeModuleProvider(
  const std::string &Filename,  ///< Name of file to be read
  BCDecompressor_t *BCDC = Compressor::decompressToNewBuffer,
  std::string* ErrMsg = 0,      ///< Optional error message holder
  BytecodeHandler* H = 0        ///< Optional handler for reader events
);

This is ugly, but allows a client to say:

  getBytecodeModuleProvider("foo", 0);

If they do this, there is no dependency on the compression libraries, saving
codesize.

llvm-svn: 34012
diff --git a/llvm/tools/opt/opt.cpp b/llvm/tools/opt/opt.cpp
index 5294cac..24dab74 100644
--- a/llvm/tools/opt/opt.cpp
+++ b/llvm/tools/opt/opt.cpp
@@ -254,7 +254,8 @@
     std::string ErrorMessage;
 
     // Load the input module...
-    std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
+    std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, 
+                            Compressor::decompressToNewBuffer, &ErrorMessage));
     if (M.get() == 0) {
       cerr << argv[0] << ": ";
       if (ErrorMessage.size())