Bug 1564700 - Disable test_bug949946.html on win32 and linux64. r=gbrown

Differential Revision: https://phabricator.services.mozilla.com/D50415

--HG--
extra : moz-landing-system : lando

dom/workers/test/mochitest.ini

@@ -108,7 +108,7 @@ support-files =
 [test_blobConstructor.html]
 [test_blobWorkers.html]
 [test_bug949946.html]
-skip-if = (android_version == '24' && debug) #crashes Bug 1564700
+skip-if = debug && ((android_version == '24') || (os == "linux" && bits == 64) || (os == "win" && bits == 32) || (os == "mac"))  #crashes Bug 1564700
 [test_bug978260.html]
 [test_bug998474.html]
 [test_bug1002702.html]