[mjsunit,ia32,debug] Disable test regress-crbug-976598

..until issue is resolved.

TBR=jarin@chromium.org

Change-Id: I304ab6bf2c4dcb28af022e07c7fc4719c5239d82
Bug: v8:9404
Notry: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1681121
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62436}

test/mjsunit/mjsunit.status

@@ -639,6 +639,12 @@
   'wasm/float-constant-folding': [SKIP],
 }],
 
+##############################################################################
+['arch == ia32 and mode == debug', {
+  # BUG(v8:9404).
+  'regress/regress-crbug-976598': [SKIP],
+}],
+
 ##############################################################################
 ['arch == mipsel or arch == mips', {