Merge 8b859c6e4a8e9ab9969582267bbdc04ed6bfa535 into 18.1.x

[brad0]

[MIPS] Fix the opcode of max.fmt and mina.fmt (#85609)

• The opcode of the mina.fmt and max.fmt is documented wrong, the
  object code compiled from the same assembly with LLVM behaves
  differently than one compiled with GCC and Binutils.

• Modify the opcodes to match Binutils. The actual opcodes are as
  follows:

  {5,3} | bits {2,0} of func
  | ... | 100 | 101 | 110 | 111
  -----+-----+-----+-----+-----+-----
  010 | ... | min | mina | max | maxa

[brad0]

/cherry-pick 8b859c6

[llvmbot]

/pull-request #88337

[llvmbot]

@llvm/issue-subscribers-backend-mips

Author: Brad Smith (brad0)

[MIPS] Fix the opcode of max.fmt and mina.fmt (#85609)

• The opcode of the mina.fmt and max.fmt is documented wrong, the
  object code compiled from the same assembly with LLVM behaves
  differently than one compiled with GCC and Binutils.

• Modify the opcodes to match Binutils. The actual opcodes are as
  follows:

  {5,3} | bits {2,0} of func
  | ... | 100 | 101 | 110 | 111
  -----+-----+-----+-----+-----+-----
  010 | ... | min | mina | max | maxa