David Green 11dee2eae2 [ARM] Ensure CountReg definition dominates InsertPt when creating t2DoLoopStartTP
Of course there was something missing, in this case a check that the def
of the count register we are adding to a t2DoLoopStartTP would dominate
the insertion point.

In the future, when we remove some of these COPY's in between, the
t2DoLoopStartTP will always become the last instruction in the block,
preventing this from happening. In the meantime we need to check they
are created in a sensible order.

Differential Revision: https://reviews.llvm.org/D91287
2020-11-12 13:47:46 +00:00
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