[SelectionDAG] Make sorting predicate stronger to remove non-deterministic ordering
Summary:
Recommitting this with the correct sorting predicate. The Low field of Clusters is a ConstantInt and
cannot be directly compared. So we needed to invoke slt (signed less than) to compare correctly.
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
LLVM :: CodeGen/X86/switch-bt.ll
LLVM :: CodeGen/X86/switch-density.ll
Reviewers: hans, fhahn
Reviewed By: hans
Subscribers: aemerson, llvm-commits, kristof.beyls
Differential Revision: https://reviews.llvm.org/D40541
llvm-svn: 319210