Blackfin: Fix problem in hardware loop discovery code

[Bernd Schmidt]

I ran across a testcase that made the compiler segfault while doing
hardware loop optimization.  When discovering suitable loops, we have
code to retry a bad loop with certain basic blocks added, but this
attempt to retry can fail.  If that happens, we must record the loop as
bad to prevent an attempt to optimize it later.

Committed as 144645.


Bernd
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