[SOL] Remove atomic_load_sub from SBF (#132)

* Remove atomic sub lowering

* Use v4 for artifact actions

Author: LucasSte

llvm/lib/Target/SBF/SBFInstrInfo.td

@@ -1099,13 +1099,6 @@ let Constraints = "$dst = $val" in {
   def XFXORD : XFALU64<SBF_DW, SBF_XOR, "xor", atomic_load_xor_64>;
 }
 
-// atomic_load_sub can be represented as a neg followed
-// by an atomic_load_add.
-def : Pat<(atomic_load_sub_32 ADDRri:$addr, GPR32:$val),
-          (XFADDW32 ADDRri:$addr, (NEG_32 GPR32:$val))>;
-def : Pat<(atomic_load_sub_64 ADDRri:$addr, GPR:$val),
-          (XFADDD ADDRri:$addr, (NEG_64 GPR:$val))>;
-
 let usesCustomInserter = 1, isCodeGenOnly = 1 in {
   def ATOMIC_FENCE : Pseudo<
     (outs),