Clement Courbet 6aaf1e7ea9 [LoopIdiom] Fix store size SCEV type. ...

We were using the type of the loop back edge count to represent the
store size. This failed for small loop counts (e.g. in the added test,
the loop count was an i2).

Use the index type instead.

Fixes PR52104.

Differential Revision: https://reviews.llvm.org/D111401

2021-10-11 09:39:06 +02:00

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