Remove an over-eager assert that was firing on one of the ARM regression tests when I forcibly enabled block placement.
Remove an over-eager assert that was firing on one of the ARM regression
tests when I forcibly enabled block placement.

It is apparantly possible for an unanalyzable block to fallthrough to
a non-loop block. I don't actually beleive this is correct, I believe
that 'canFallThrough' is returning true needlessly for the code
construct, and I've left a bit of a FIXME on the verification code to
try to track down why this is coming up.

Anyways, removing the assert doesn't degrade the correctness of the algorithm.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@144532 91177308-0d34-0410-b5e6-96231b3b80d8

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