This fixes parsing of forward references to unnamed aliases.
While here, remove an unnecessary isa check.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254054 91177308-0d34-0410-b5e6-96231b3b80d8
If globals can be unnamed, there is no reason for aliases to be different.
The restriction was there since the original implementation in r36435. I
can only guess it was there because of the old bison parser for the old
alias syntax.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239921 91177308-0d34-0410-b5e6-96231b3b80d8