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[SelectionDAG] Make sorting predicate stronger to remove non-deterministic…

Description

[SelectionDAG] Make sorting predicate stronger to remove non-deterministic ordering

Summary:
This fixes failures in the following tests uncovered by D39245:

LLVM :: CodeGen/ARM/ifcvt3.ll
LLVM :: CodeGen/ARM/switch-minsize.ll
LLVM :: CodeGen/X86/switch.ll

Reviewers: hans, efriedma

Reviewed By: hans

Subscribers: fhahn, aemerson, kristof.beyls, llvm-commits

Differential Revision: https://reviews.llvm.org/D39995