PPC: fix mtvsrdd on disassembler

Change-Id: Ie16a4542179a9661991a4e1696d1b7a952b0e305
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2936605Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#74941}

src/diagnostics/ppc/disasm-ppc.cc

@@ -1098,7 +1098,7 @@ void Decoder::DecodeExt2(Instruction* instr) {
       return;
     }
     case MTVSRDD: {
-      Format(instr, "mtvsrwz 'Xt, 'ra");
+      Format(instr, "mtvsrdd 'Xt, 'ra");
       return;
     }
     case LDBRX: {