Jakob Stoklund Olesen 4976d0df41 Don't dereference begin() on an empty vector. ...

The fix is obvious and the only test case I have is horrible, so I am
not including it. The problem shows up when self-hosting clang on i386
with -new-coalescer enabled.

llvm-svn: 164793

2012-09-27 21:05:59 +00:00

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