Update llvmconst, to represent empty fields

We used to handle empty fields by skipping them entirely. With the tuple change, I believe this was switched to be represented as a zero-length LLVM array.

src/intrinsics.cpp

@@ -215,8 +215,7 @@ static Constant *julia_const_to_llvm(jl_value_t *e)
  JL_GC_POP();
  return NULL;
  }
- if (val->getType() != NoopType)
- fields[llvm_nf++] = val;
+ fields[llvm_nf++] = val;
  }
  JL_GC_POP();
  Type *t = julia_struct_to_llvm(jt);