[AArch64] Remove unnecessary extloadi32 -> i32 pattern. NFCI (#159527)

As far as I can tell this load pattern will not perform anything as it
could only trigger from a i32 MemVT extended to a i32.

Author: davemgreen

llvm/lib/Target/AArch64/AArch64InstrInfo.td

@@ -3844,22 +3844,20 @@ let AddedComplexity = 10 in {
 }
 
 
-// zextload -> i64
+// zextload -> i32
 multiclass ExtLoadTo32ROPat<ROAddrMode ro, SDPatternOperator loadop,
                             Instruction INSTW, Instruction INSTX> {
   def : Pat<(i32 (loadop (ro.Wpat GPR64sp:$Rn, GPR32:$Rm, ro.Wext:$extend))),
             (INSTW GPR64sp:$Rn, GPR32:$Rm, ro.Wext:$extend)>;
 
   def : Pat<(i32 (loadop (ro.Xpat GPR64sp:$Rn, GPR64:$Rm, ro.Xext:$extend))),
             (INSTX GPR64sp:$Rn, GPR64:$Rm, ro.Xext:$extend)>;
-
 }
 
 let AddedComplexity = 10 in {
   // extload -> zextload
   defm : ExtLoadTo32ROPat<ro8,  extloadi8,   LDRBBroW, LDRBBroX>;
   defm : ExtLoadTo32ROPat<ro16, extloadi16,  LDRHHroW, LDRHHroX>;
-  defm : ExtLoadTo32ROPat<ro32, extloadi32,  LDRWroW,  LDRWroX>;
 
   // zextloadi1 -> zextloadi8
   defm : ExtLoadTo32ROPat<ro8, zextloadi1, LDRBBroW, LDRBBroX>;