[polly] independent blocks: when moving values, invalidate SCEV cached info

[Sebastian Pop]

Hi,

IndependentBlocks::moveOperandTree already calls SE->forgetValue() in exactly
one case, however there are other cases where it does not call forgetValue
leading to crashes due to cached SCEVs that refer to values that no longer
exist.  The attached patch adds more calls to forgetValue whenever a value is
moved (and so renamed) to the new code generated for the scop.

Ok to commit?

Thanks,
Sebastian
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