AMDGPU/SI: v_mac_legacy_f32 does not exist on VI

[arsenm]

LGTM

lib/Target/AMDGPU/SIInstructions.td

defm V_WRITELANE_B32 : VOP2SI_3VI_m <
   (outs VGPR_32:$vdst),
   (ins SReg_32:$src0, SCSrc_32:$src1),
   "v_writelane_b32 $vdst, $src0, $src1"
 >;
 
 // These instructions only exist on SI and CI
 let SubtargetPredicate = isSICI in {
 
+let isCommutable = 1 in {
+defm V_MAC_LEGACY_F32 : VOP2InstSI <vop2<0x6>, "v_mac_legacy_f32",
+  VOP_F32_F32_F32
+>;
+} // End isCommutable = 1
+
 defm V_MIN_LEGACY_F32 : VOP2InstSI <vop2<0xd>, "v_min_legacy_f32",
   VOP_F32_F32_F32, AMDGPUfmin_legacy
 >;
 defm V_MAX_LEGACY_F32 : VOP2InstSI <vop2<0xe>, "v_max_legacy_f32",
   VOP_F32_F32_F32, AMDGPUfmax_legacy
 >;
 
 let isCommutable = 1 in {
 defm V_LSHR_B32 : VOP2InstSI <vop2<0x15>, "v_lshr_b32", VOP_I32_I32_I32>;
 defm V_ASHR_I32 : VOP2InstSI <vop2<0x17>, "v_ashr_i32", VOP_I32_I32_I32>;
 defm V_LSHL_B32 : VOP2InstSI <vop2<0x19>, "v_lshl_b32", VOP_I32_I32_I32>;
 } // End isCommutable = 1
 } // End let SubtargetPredicate = SICI
 
-let isCommutable = 1 in {
-defm V_MAC_LEGACY_F32 : VOP2_VI3_Inst <vop23<0x6, 0x28e>, "v_mac_legacy_f32",
-  VOP_F32_F32_F32
->;
-} // End isCommutable = 1
-
 defm V_BFM_B32 : VOP2_VI3_Inst <vop23<0x1e, 0x293>, "v_bfm_b32",
   VOP_I32_I32_I32
 >;
 defm V_BCNT_U32_B32 : VOP2_VI3_Inst <vop23<0x22, 0x28b>, "v_bcnt_u32_b32",
   VOP_I32_I32_I32
 >;
 defm V_MBCNT_LO_U32_B32 : VOP2_VI3_Inst <vop23<0x23, 0x28c>, "v_mbcnt_lo_u32_b32",
   VOP_I32_I32_I32