[polly] block generators: fix insertion of values in BBMap

[Sebastian Pop]

Tobias Grosser wrote:
> On 05/03/2013 01:35 PM, Tobias Grosser wrote:
> >On 05/03/2013 07:22 PM, Sebastian Pop wrote:
> >>Tobias Grosser wrote:
> >>>On 05/02/2013 11:19 PM, Sebastian Pop wrote:
> [...
> 
> >>>This is very surprising. I don't really understand how this fixes
> >>>the problem. Can you provide a reduced test case?
> >>
> >>Nop, I cannot provide a reduced testcase: the most reduced one that I
> >>remember
> >>having seen spans over several screens of bytecode.  It occurs in one
> >>of the
> >>benchmarks in the test-suite with -polly-codegen-scev=true.
> >
> >Can you send me this one?
> 
> Hi Sebastian,
> 
> would you mind sending this test case to me?

I have lost the original testcase, so I'm reducing another testcase: I don't see
the same patterns occurring in the current tree, and I also have noted several
new regressions after we removed RegionSimplify. Even in our current testsuite,
we have an ICE with scev-codegen on: Isl/CodeGen/20110226-PHI-Node-removed.ll

Sebastian
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