S390: Fix DCHECK on simulating VCGD

Change-Id: Ic2f49e2808460100c9125542edd0f01e97f83acd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2778335Reviewed-by: Junliang Yan <junyan@redhat.com>
Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#73577}

src/execution/s390/simulator-s390.cc

@@ -3591,7 +3591,7 @@ EVALUATE(VCDLG) {
     break;                                                            \
   }
 EVALUATE(VCGD) {
-  DCHECK_OPCODE(VCDG);
+  DCHECK_OPCODE(VCGD);
   DECODE_VRR_A_INSTRUCTION(r1, r2, m5, m4, m3);
   USE(m4);
   switch (m3) {