[M68k] Fix decoding conflict between move instructions and their tail call version

[0x59616e]

Summary

This diff resolves the the remaining decoding conflict that occurs when you build M68k backend.

[0x59616e]

Didn't notice some test were failed.

[0x59616e]

Fix failed test

[myhsu]

LGTM. Thanks for fixing it.
Large portion of this patch seems to be additional tests for MOVE. Can you split them into a separate commit? (no need to create another Phab review, I've reviewed those test cases)

[0x59616e]

Thanks for reviewing ;)

In D125948#3529764, @myhsu wrote:

LGTM. Thanks for fixing it.
Large portion of this patch seems to be additional tests for MOVE. Can you split them into a separate commit? (no need to create another Phab review, I've reviewed those test cases)

Sure !

llvm/lib/Target/M68k/M68kInstrData.td

 
 // Tail call version
 let Pattern = [(null_frag)] in {
   foreach REG = ["r", "a"] in
   foreach AM = MxMoveSupportedAMs in {
     foreach TYPE = [MxType16, MxType32] in
     def MOV # TYPE.Size # REG # AM # _TC
         : MxMove_RM<TYPE, REG, !cast<MxOpBundle>("MxOp"#TYPE.Size#"AddrMode_"#AM),
-                    !cast<MxEncMemOp>("MxMoveSrcOpEnc_"#AM)>;
+                    !cast<MxEncMemOp>("MxMoveSrcOpEnc_"#AM)> {
+      let isCodeGenOnly = true;
+    }
   } // foreach AM
 } // let Pattern
 
 let mayLoad = 1, mayStore = 1 in
 class MxMove_MM<MxType TYPE, MxOpBundle DST, MxOpBundle SRC,
                 MxEncMemOp DST_ENC, MxEncMemOp SRC_ENC>
     : MxMove<TYPE.Prefix, (outs), (ins DST.Op:$dst, SRC.Op:$src),
              [(store (TYPE.Load SRC.Pat:$src), DST.Pat:$dst)],