Anonymous definitions in foreach blocks triggered a 'def already exists'

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210526 91177308-0d34-0410-b5e6-96231b3b80d8
Refactoring in AsmWriterEmitter::EmitPrintAliasInstruction()

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210527 91177308-0d34-0410-b5e6-96231b3b80d8