[Mips] Fix atomic min/max generate mips4 instructions when compiling for mips2 (#159717) Modify instr movn/movz to mixture of beq, move, and sc. Because atomic-min-max.ll test broken on the expensive builder, I revert https://github.com/llvm/llvm-project/pull/149983 and resubmit this PR. The broken reason: In i16/i8 function expandAtomicBinOpSubword, we use two successor after loop2MBB, one does not specify the second parameter, the other use BranchProbability::getOne() that means 100% probability. This is contradictory. And the second successor is also specified incorrectly. The changess: * llvm/lib/Target/Mips/MipsExpandPseudo.cpp: Change loop2MBB`s second successor to correct one and delete the second parameter BranchProbability::getOne(). * llvm/test/CodeGen/Mips/atomic-min-max.ll: Add -verify-machineinstrs option in RUN command; Modify i16 test and i8 test according to the changes. Fix #145411.
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