4957990: Perm heap bloat in JVM

Treat ProfileData in MDO's as a source of weak, not strong, roots. Fixes the bug for stop-world collection -- the case of concurrent collection will be fixed separately.

Reviewed-by: jcoomes, jmasa, kvn, never

hotspot/src/share/vm/interpreter/interpreterRuntime.hpp

@@ -49,6 +49,9 @@ class InterpreterRuntime: AllStatic {
   static ConstantPoolCacheEntry* cache_entry(JavaThread *thread)            { return cache_entry_at(thread, Bytes::get_native_u2(bcp(thread) + 1)); }
   static void      note_trap(JavaThread *thread, int reason, TRAPS);
 
+  // Inner work method for Interpreter's frequency counter overflow
+  static nmethod* frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp);
+
  public:
   // Constants
   static void    ldc           (JavaThread* thread, bool wide);