[bugpoint] Do not initialize disassembler passes

We added the initilization of disassembler passes in r306208 with the goal to
bring bugpoint in line with 'opt'. However, 'opt' does itself not initialize
dissassembler passes. As our goal was consistency, we drop the initialization
of dissassembler passes again from bugpoint.

Thanks to Chandler for pointing this out!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306275 91177308-0d34-0410-b5e6-96231b3b80d8

tools/bugpoint/bugpoint.cpp

@@ -144,7 +144,6 @@ int main(int argc, char **argv) {
     InitializeAllTargetMCs();
     InitializeAllAsmPrinters();
     InitializeAllAsmParsers();
-    InitializeAllDisassemblers();
   }
 
   cl::ParseCommandLineOptions(argc, argv,