re PR libgcj/12475 (Stack traces leak memory)

Fix PR libgcj/12475
	* gnu/gcj/runtime/StackTrace.java (finalize): Declare.
	* gnu/gcj/runtime/natStackTrace.cc (finalize): New. Free "addrs".

From-SVN: r72012

libjava/gnu/gcj/runtime/StackTrace.java

@@ -157,6 +157,7 @@ public final class StackTrace
   }
   
   private native void fillInStackTrace(int n, int offset);
+  protected native void finalize();
 
   private static native MethodRef getCompiledMethodRef(RawData addr);
   private static IdentityHashMap map = new IdentityHashMap();

libjava/gnu/gcj/runtime/natStackTrace.cc

@@ -200,4 +200,9 @@ gnu::gcj::runtime::StackTrace::update(void)
     }
 }
 
-
+void
+gnu::gcj::runtime::StackTrace::finalize(void)
+{
+  if (addrs != NULL)
+    _Jv_Free (addrs);
+}