Skip test unsuitable for gc fuzzing

TBR=sigurds@chromium.org
NOTRY=true

Change-Id: I5c6988aa5670deaed59647e2dd4b40ee9c368a20
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1549155Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60569}

test/mjsunit/mjsunit.status

@@ -810,6 +810,7 @@
   'compiler/array-slice-clone': [SKIP],
   'compiler/dataview-neutered': [SKIP],
   'compiler/native-context-specialization-hole-check': [SKIP],
+  'compiler/regress-5320': [SKIP],
   'elements-transition-hoisting': [SKIP],
   'es6/collections-constructor-custom-iterator': [SKIP],
   'field-type-tracking': [SKIP],