Turn off dump/emit routines when building minimal subzero.

src/IceTypes.cpp

 //===- subzero/src/IceTypes.cpp - Primitive type properties ---------------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines a few attributes of Subzero primitive types.
@@ skipping 242 matching lines @@
 
 const char *typeString(Type Ty) {
   size_t Index = static_cast<size_t>(Ty);
   if (Index < IceType_NUM)
     return TypeAttributes[Index].DisplayString;
   llvm_unreachable("Invalid type for typeString");
   return "???";
 }
 
 void FuncSigType::dump(Ostream &Stream) const {
+  if (!ALLOW_DUMP)
+    return;
   Stream << ReturnType << " (";
   bool IsFirst = true;
   for (const Type ArgTy : ArgList) {
     if (IsFirst) {
       IsFirst = false;
     } else {
       Stream << ", ";
     }
     Stream << ArgTy;
   }
   Stream << ")";
 }
 
 } // end of namespace Ice