[llvm-commits] Fix overzealous assert in PHIElimination

[Philipp Brüschweiler]

Hi,

PHIElimination currently contains an assert enforcing that at most one
terminator at the end of a block is allowed to use a virtual register
that is about to be marked as killed. This restriction doesn't make any
sense for a backend I'm currently helping to develop (and I suspect it
doesn't make sense in general).

This patch instead searches for the last terminator using the
aforementioned register. This fix was suggested here [1]. All tests
still pass.

Cheers,
Philipp

[1] http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-July/051447.html
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