Move comments to pseudo instruction

Author: jwanggit86

llvm/lib/Target/AMDGPU/VOP2Instructions.td

@@ -1344,6 +1344,8 @@ def V_FMAAK_F64 : VOP2_Pseudo<"v_fmaak_f64", VOP_MADAK_F64, [], "">;
 } // End SubtargetPredicate = HasFmaakFmamkF64Insts, isReMaterializable = 1, FixedSize = 1, Size = 12, SchedRW = [Write64Bit]
 
 let SubtargetPredicate = HasPkFmacF16Inst in {
+// FIXME: V_PK_FMAC_F16 is currently not used in instruction selection.
+// If this changes, ensure the DPP variant is not used for GFX11+.
 defm V_PK_FMAC_F16 : VOP2Inst<"v_pk_fmac_f16", VOP_V2F16_V2F16_V2F16>;
 } // End SubtargetPredicate = HasPkFmacF16Inst
 
@@ -1966,8 +1968,6 @@ defm V_SUBREV_CO_CI_U32 :
 
 defm V_CVT_PK_RTZ_F16_F32  : VOP2_Real_FULL_with_name_gfx11_gfx12<0x02f,
   "V_CVT_PKRTZ_F16_F32", "v_cvt_pk_rtz_f16_f32">;
-// FIXME: V_PK_FMAC_F16 is currently not used in instruction selection.
-// If this changes, ensure the DPP variant is not used for GFX11+.
 defm V_PK_FMAC_F16     : VOP2_Real_e32_gfx11_gfx12<0x03c>;
 
 defm V_ADD_F16             : VOP2_Real_FULL_t16_and_fake16_gfx11_gfx12<0x032, "v_add_f16">;