Bug 957110 - Don't assert nursery start address when then nursery is disabled r=terrence

js/src/gc/Nursery.cpp

@@ -103,8 +103,10 @@ bool
 js::Nursery::isEmpty() const
 {
     JS_ASSERT(runtime_);
+    if (!isEnabled())
+        return true;
     JS_ASSERT_IF(runtime_->gcZeal_ != ZealGenerationalGCValue, currentStart_ == start());
-    return !isEnabled() || position() == currentStart_;
+    return position() == currentStart_;
 }
 
 void *

js/src/jit-test/tests/gc/bug-957110.js

@@ -0,0 +1,6 @@
+gczeal(7,1);
+try {
+gcparam("maxBytes", gcparam("gcBytes") + 4*1024);
+newGlobal("same-compartment");
+} catch(exc1) {}
+gczeal(1);