[ARM] Use sub for negative offset load/store in thumb1

[ARM] Use sub for negative offset load/store in thumb1

This attempts to optimise negative values used in load/store operands
a little. We currently try to selct them as rr, materialising the
negative constant using a MOV/MVN pair. This instead selects ri with
an immediate of 0, forcing the add node to become a simpler sub.

Differential Revision: https://reviews.llvm.org/D57121

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@352475 91177308-0d34-0410-b5e6-96231b3b80d8