Tim Northover 77e5760b43 MCParser: diagnose missing directional labels more clearly.
Before, ELF at least managed a diagnostic but it was a completely untraceable
"undefined symbol" error. MachO had a variety of even worse behaviours: crash,
emit corrupt file, or an equally bad message.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265984 91177308-0d34-0410-b5e6-96231b3b80d8
2016-04-11 19:50:46 +00:00
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