Bug 1287063 - Remove isGCScheduled check from activeGCInAtomsZone. r=jonco

js/src/jit-test/tests/gc/bug1287063.js

@@ -0,0 +1,4 @@
+if (helperThreadCount() === 0)
+    quit();
+schedulegc("");
+offThreadCompileScript("");

js/src/vm/Runtime.cpp

@@ -854,7 +854,6 @@ JSRuntime::activeGCInAtomsZone()
 {
     Zone* zone = atomsCompartment_->zone();
     return (zone->needsIncrementalBarrier() && !gc.isVerifyPreBarriersEnabled()) ||
-           zone->isGCScheduled() ||
            zone->wasGCStarted();
 }