Fix to 54307. Patch courtesy Jon Smirl <jon@mediaone.net>.

Clean up several locks that jsdtoa uses, when JS_THREADSAFE.

a=brendan
r=mccabe

js/src/jsdtoa.c

@@ -1072,6 +1072,17 @@ static void InitDtoa(void)
 }
 #endif
 
+void js_FinishDtoa(void)
+{
+#ifdef JS_THREADSAFE
+    if (initialized == JS_TRUE) 
+    {
+        PR_DestroyLock(freelist_lock);
+        PR_DestroyLock(p5s_lock);
+        initialized = JS_FALSE;
+    }
+#endif
+}
 
 /* nspr2 watcom bug ifdef omitted */
 

js/src/jslock.c

@@ -459,6 +459,9 @@ js_SetupLocks(int l, int g)
     return 1;
 }
 
+// pull in the cleanup function from jsdtoa.c
+extern void js_FinishDtoa(void);
+
 void
 js_CleanupLocks()
 {
@@ -484,6 +487,7 @@ js_CleanupLocks()
         PR_DestroyLock(_compare_and_swap_lock);
         _compare_and_swap_lock = NULL;
 #endif
+        js_FinishDtoa();
     }
 }