[M68k] Fix MOVZXd32d16 illegally operating on address registers

Sext and zext are applied by using EXT or ANDI on the destination
register. In some cases, the destination register could be an address
register, which doesn't support those instructions. This change enforces
the instruction to only be available on data registers.

Author: dansalvato

llvm/lib/Target/M68k/M68kInstrData.td

@@ -607,7 +607,7 @@ foreach EXT = ["S", "Z"] in {
 
     def MOV#EXT#Xd16d8  : MxPseudoMove_RR<MxType16d,  MxType8d>;
     def MOV#EXT#Xd32d8  : MxPseudoMove_RR<MxType32d,  MxType8d>;
-    def MOV#EXT#Xd32d16 : MxPseudoMove_RR<MxType32r, MxType16r>;
+    def MOV#EXT#Xd32d16 : MxPseudoMove_RR<MxType32d, MxType16d>;
 
     let mayLoad = 1 in {