Sam Parker d377332d77 [ARM] Disallow icmp with negative imm and overflow
We allow overflowing instructions if they're decreasing and only used
by an unsigned compare. Add the extra condition that the icmp cannot
be using a negative immediate.

Differential Revision: https://reviews.llvm.org/D52102


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@342392 91177308-0d34-0410-b5e6-96231b3b80d8
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