mips: MSA support for mips32/mips64.

mips: MSA support for mips32/mips64.

Full support of MIPS SIMD Architecture Module (MSA) instruction set.

Following IOPs have been implemented using generation of MSA instructions:

  Iop_GetElem8x16, Iop_GetElem16x8, Iop_GetElem32x4, Iop_GetElem64x2,
  Iop_V128to32, Iop_V128HIto64, Iop_V128to64, Iop_F32toF16x4, Iop_Abs64x2,
  Iop_Abs32x4, Iop_Abs16x8, Iop_Abs8x16, Iop_Cnt8x16, Iop_NotV128,
  Iop_Reverse8sIn16_x8, Iop_Reverse8sIn32_x4, Iop_Reverse8sIn64_x2,
  Iop_Cls8x16, Iop_Cls16x8, Iop_Cls32x4, Iop_Clz8x16, Iop_Clz16x8,
  Iop_Clz32x4, Iop_Clz64x2, Iop_Abs32Fx4, Iop_Abs64Fx2, Iop_RecipEst32Fx4,
  Iop_RecipEst64Fx2, Iop_RSqrtEst32Fx4, Iop_RSqrtEst64Fx2, Iop_F16toF32x4,
  Iop_I32UtoFx4, Iop_FtoI32Sx4_RZ, Iop_FtoI32Ux4_RZ, Iop_Add8x16,
  Iop_Add16x8, Iop_Add32x4, Iop_Add64x2, Iop_Sub8x16, Iop_Sub16x8,
  Iop_Sub32x4, Iop_Sub64x2, Iop_QAdd8Sx16, Iop_QAdd16Sx8, Iop_QAdd32Sx4,
  Iop_QAdd64Sx2, Iop_QAdd8Ux16, Iop_QAdd16Ux8, Iop_QAdd32Ux4,
  Iop_QAdd64Ux2, Iop_QSub8Sx16, Iop_QSub16Sx8, Iop_QSub32Sx4,
  Iop_QSub64Sx2, Iop_QSub8Ux16, Iop_QSub16Ux8, Iop_QSub32Ux4,
  Iop_QSub64Ux2, Iop_QDMulHi32Sx4, Iop_QDMulHi16Sx8, Iop_QRDMulHi32Sx4,
  Iop_QRDMulHi16Sx8, Iop_Max8Sx16, Iop_Max16Sx8, Iop_Max32Sx4, Iop_Max64Sx2,
  Iop_Max8Ux16, Iop_Max16Ux8, Iop_Max32Ux4, Iop_Max64Ux2, Iop_Min8Sx16,
  Iop_Min16Sx8, Iop_Min32Sx4, Iop_Min64Sx2, Iop_Min8Ux16, Iop_Min16Ux8,
  Iop_Min32Ux4, Iop_Min64Ux2, Iop_Shl8x16, Iop_Shl16x8, Iop_Shl32x4,
  Iop_Shl64x2, Iop_Shr8x16, Iop_Shr16x8, Iop_Shr32x4, Iop_Shr64x2,
  Iop_Sar8x16, Iop_Sar16x8, Iop_Sar32x4, Iop_Sar64x2, Iop_InterleaveHI8x16,
  Iop_InterleaveHI16x8, Iop_InterleaveHI32x4, Iop_InterleaveHI64x2,
  Iop_InterleaveLO8x16, Iop_InterleaveLO16x8, Iop_InterleaveLO32x4,
  Iop_InterleaveLO64x2, Iop_InterleaveEvenLanes8x16,
  Iop_InterleaveEvenLanes16x8, Iop_InterleaveEvenLanes32x4,
  Iop_InterleaveOddLanes8x16, Iop_InterleaveOddLanes16x8,
  Iop_InterleaveOddLanes32x4, Iop_CmpEQ8x16, Iop_CmpEQ16x8, Iop_CmpEQ32x4,
  Iop_CmpEQ64x2, Iop_CmpGT8Sx16, Iop_CmpGT16Sx8, Iop_CmpGT32Sx4,
  Iop_CmpGT64Sx2, Iop_CmpGT8Ux16, Iop_CmpGT16Ux8, Iop_CmpGT32Ux4,
  Iop_CmpGT64Ux2, Iop_Avg8Sx16, Iop_Avg16Sx8, Iop_Avg32Sx4, Iop_Avg8Ux16,
  Iop_Avg16Ux8, Iop_Avg32Ux4, Iop_Mul8x16, Iop_Mul16x8, Iop_Mul32x4,
  Iop_AndV128, Iop_OrV128, Iop_XorV128, Iop_ShrV128, Iop_ShlV128,
  Iop_ShlN8x16, Iop_ShlN16x8, Iop_ShlN32x4, Iop_ShlN64x2, Iop_SarN8x16,
  Iop_SarN16x8, Iop_SarN32x4, Iop_SarN64x2, Iop_ShrN8x16, Iop_ShrN16x8,
  Iop_ShrN32x4, Iop_ShrN64x2, Iop_QandQSarNnarrow64Sto32Sx2,
  Iop_QandQSarNnarrow32Sto16Sx4, Iop_QandQRSarNnarrow64Sto32Sx2,
  Iop_QandQRSarNnarrow32Sto16Sx4, Iop_CmpEQ32Fx4, Iop_CmpEQ64Fx2,
  Iop_CmpLT32Fx4, Iop_CmpLT64Fx2, Iop_CmpLE32Fx4, Iop_CmpLE64Fx2,
  Iop_CmpUN32Fx4, Iop_CmpUN64Fx2, Iop_64HLtoV128, Iop_Min32Fx4,
  Iop_Min64Fx2, Iop_Max32Fx4, Iop_Max64Fx2, Iop_Sqrt32Fx4,
  Iop_Sqrt64Fx2, Iop_Add32Fx4, Iop_Add64Fx2, Iop_Sub32Fx4,
  Iop_Sub64Fx2, Iop_Mul32Fx4, Iop_Mul64Fx2, Iop_Div32Fx4,
  Iop_Div64Fx2, Iop_F32x4_2toQ16x8, Iop_F64x2_2toQ32x4,
  Iop_ScaleF64, Scale2_64Fx2, Scale2_32Fx4, Iop_Log2_32Fx4, Iop_Log2_64Fx2,
  Iop_PackOddLanes8x16, Iop_PackEvenLanes8x16, Iop_PackOddLanes16x8,
  Iop_PackEvenLanes16x8, Iop_PackOddLanes32x4, Iop_PackEvenLanes32x4.

Folowing IOPs have been implemented without generating MSA instructions:

  Iop_CmpEQ8, Iop_MullU8, Iop_MullS8, Iop_MullU16, Iop_MullS16, Iop_DivS32,
  Iop_DivU32, Iop_DivS64, Iop_DivU64, Iop_F32toI32U, Iop_F64toI64U,
  Iop_I64UtoF64

Imlementation of the following IOPs has been changed in order to use MSA
when it is possible:

  Iop_MAddF64, Iop_MSubF32, Iop_MSubF64.

Contributed by:
  Tamara Vlahovic, Aleksandar Rikalo and Aleksandra Karadzic.

Related BZ issue - #382563.