reject void pointers with a nice error:

reject void pointers with a nice error:

llvm-as: t.ll:2:15: pointers to void are invalid, use i8* instead
%X = type void*
              ^

instead of asserting and dying.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64089 91177308-0d34-0410-b5e6-96231b3b80d8