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

[Sebastian Pop]

Sebastian Pop wrote:
> I was not able to reproduce this problem in the current tree

Sorry, this is not true: with the current tree, I am able to see the problem in
these benchmarks:

-MultiSource/Benchmarks/MiBench/telecomm-gsm/telecomm-gsm
-MultiSource/Benchmarks/mediabench/gsm/toast/toast
-SingleSource/Benchmarks/Misc/flops
-SingleSource/Benchmarks/Misc/salsa20

Sebastian
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