[polly] independent blocks: do not insert stores between phi nodes

[Sebastian Pop]

Hi,

When translateScalarToArray tranlates a phi node to an array, it does not make
sure that the insertion point is after all the phi nodes of the basic block, and
that could lead to a mix of phi nodes and translated stmts: this ICEs one of the
verifiers that expects to see all the phi nodes grouped at the beginning of a
basic block.  The patch moves the insertion point for the translation of a phi
node after all the phi nodes.

Ok to commit?

Thanks,
Sebastian
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