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[Hexagon] Use stable sort for HexagonShuffler to remove non-deterministic…

Description

[Hexagon] Use stable sort for HexagonShuffler to remove non-deterministic ordering

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

LLVM :: CodeGen/Hexagon/args.ll
LLVM :: CodeGen/Hexagon/constp-extract.ll
LLVM :: CodeGen/Hexagon/expand-condsets-basic.ll
LLVM :: CodeGen/Hexagon/gp-rel.ll
LLVM :: CodeGen/Hexagon/packetize_cond_inst.ll
LLVM :: CodeGen/Hexagon/simple_addend.ll
LLVM :: CodeGen/Hexagon/swp-stages4.ll
LLVM :: CodeGen/Hexagon/swp-vmult.ll
LLVM :: CodeGen/Hexagon/swp-vsum.ll
LLVM :: MC/Hexagon/align.s
LLVM :: MC/Hexagon/asmMap.s
LLVM :: MC/Hexagon/dis-duplex-p0.s
LLVM :: MC/Hexagon/double-vector-producer.s
LLVM :: MC/Hexagon/inst_select.ll
LLVM :: MC/Hexagon/instructions/j.s

Reviewers: colinl, kparzysz, adasgupt, slarin

Reviewed By: kparzysz

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D40227