8058737: CodeCache::find_blob fails with 'unsafe access to zombie method'

Remove active ICStubs from zombie nmethods

Reviewed-by: kvn, iveresov

hotspot/src/share/vm/code/nmethod.hpp

@@ -577,6 +577,7 @@ public:
 
   // Inline cache support
   void clear_inline_caches();
+  void clear_ic_stubs();
   void cleanup_inline_caches();
   bool inlinecache_check_contains(address addr) const {
     return (addr >= code_begin() && addr < verified_entry_point());