[AMDGPU] Remove obsolete comments from VOP1Instructions.td. NFC. (#153249)

Author: rampitec

llvm/lib/Target/AMDGPU/VOP1Instructions.td

@@ -706,7 +706,6 @@ def V_CVT_F16_F8_Fake16_Profile : VOP3_Profile_Fake16<V_CVT_F16_F8_Profile>;
 
 let SubtargetPredicate = isGFX12Plus, OtherPredicates = [HasFP8ConversionInsts],
     mayRaiseFPException = 0, SchedRW = [WriteFloatCvt] in {
-  // FIXME: This differs from downstream due to changes that haven't been upstreamed yet.
   let SubtargetPredicate = isGFX12PlusNot12_50 in
     defm V_CVT_F32_FP8_OP_SEL    : VOP1Inst<"v_cvt_f32_fp8_op_sel", VOPProfile_Base_CVT_F_F8_ByteSel<f32>>;
   let SubtargetPredicate = isGFX125xOnly in
@@ -731,7 +730,6 @@ class Cvt_F_F8_Pat_ByteSel<SDPatternOperator node, VOP3_Pseudo inst, bit HasOpSe
 >;
 
 let OtherPredicates = [HasFP8ConversionInsts] in {
-  // FIXME: This differs from downstream due to changes that haven't been upstreamed yet.
   let SubtargetPredicate = isGFX12PlusNot12_50 in
     def : Cvt_F_F8_Pat_ByteSel<int_amdgcn_cvt_f32_fp8, V_CVT_F32_FP8_OP_SEL_e64>;
   let SubtargetPredicate = isGFX125xOnly in {
@@ -740,7 +738,6 @@ let OtherPredicates = [HasFP8ConversionInsts] in {
     def : GCNPat<(int_amdgcn_cvt_f32_fp8_e5m3 i32:$src0, timm:$byte_sel),
                  (V_CVT_F32_FP8_gfx1250_e64 $src0, DSTCLAMP.ENABLE, (as_i32timm $byte_sel))>;
   }
-  // FIXME: This differs from downstream due to changes that haven't been upstreamed yet.
   let SubtargetPredicate = isGFX12Plus in
     def : Cvt_F_F8_Pat_ByteSel<int_amdgcn_cvt_f32_bf8, V_CVT_F32_BF8_OP_SEL_e64>;
 }