Bug 1594401 - Enable hashtable assertions on fuzzing builds. r=froydnj

Differential Revision: https://phabricator.services.mozilla.com/D51996

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

Author: emilio

xpcom/ds/PLDHashTable.h

@@ -23,7 +23,7 @@
 using PLDHashNumber = mozilla::HashNumber;
 static const uint32_t kPLDHashNumberBits = mozilla::kHashNumberBits;
 
-#ifdef DEBUG
+#if defined(DEBUG) || defined(FUZZING)
 #define MOZ_HASH_TABLE_CHECKS_ENABLED 1
 #endif