[LoopInterchange] Remove support for inner-only reductions.

Inner-loop only reductions require additional checks to make sure they
form a load-phi-store cycle across inner and outer loop. Otherwise the
reduction value is not properly preserved. This patch disables
interchanging such loops for now, as it causes miscompiles in some
cases and it seems to apply only for a tiny amount of loops. Across the
test-suite, SPEC2000 and SPEC2006, 61 instead of 62 loops are
interchange with inner loop reduction support disabled. With
-loop-interchange-threshold=-1000, 3256 instead of 3267.

See the discussion and history of D53027 for an outline of how such legality
checks could look like.

Reviewers: efriedma, mcrosier, davide

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D53027

llvm-svn: 345877