[AVR] Match static data load instructions to LPMRdZ

(avr-rust/rust-legacy-fork#47)

Author: gergoerdi

lib/Target/AVR/AVRInstrInfo.td

@@ -1189,7 +1189,7 @@ isReMaterializable = 1 in
                       (outs GPR8:$reg),
                       (ins LDSTPtrReg:$ptrreg),
                       "ld\t$reg, $ptrreg",
-                      [(set GPR8:$reg, (load i16:$ptrreg))]>,
+                      []>,
                 Requires<[HasSRAM]>;
 
   // LDW Rd+1:Rd, P
@@ -1457,7 +1457,7 @@ hasSideEffects = 0 in
                      (outs GPR8:$dst),
                      (ins ZREGS:$z),
                      "lpm\t$dst, $z",
-                     []>,
+                     [(set GPR8:$dst, (load i16:$z))]>,
                Requires<[HasLPMX]>;
 
   def LPMWRdZ : Pseudo<(outs DREGS:$dst),