Sam Parker 84fd0c3bf2 [ARM] Improve loop unrolling for Cortex-M ...

- Set the default runtime unroll count to 4 and use the newly added
  UnrollRemainder option.
- Create loop cost and force unroll for a cost less than 12.
- Disable unrolling on Thumb1 only targets.

Differential Revision: https://reviews.llvm.org/D36134

llvm-svn: 310997

2017-08-16 07:42:44 +00:00

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