[DAGCombine][X86][AArch64][ARM] (C - x) + y -> (y - x) + C fold

[DAGCombine][X86][AArch64][ARM] (C - x) + y  ->  (y - x) + C  fold

Summary:
All changes except ARM look **great**.
https://rise4fun.com/Alive/R2M

The regression `test/CodeGen/ARM/addsubcarry-promotion.ll`
is recovered fully by D62392 + D62450.

Reviewers: RKSimon, craig.topper, spatel, rogfer01, efriedma

Reviewed By: efriedma

Subscribers: dmgreen, javed.absar, kristof.beyls, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62266

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362487 91177308-0d34-0410-b5e6-96231b3b80d8