Bug 1479076 - Add LazyScript::maybeCompartment. r=jonco

js/src/jit-test/tests/auto-regress/bug1479076.js

@@ -0,0 +1,6 @@
+fullcompartmentchecks(true);
+var dbg = new Debugger();
+var g = newGlobal();
+g.eval("function f(){}");
+dbg.addDebuggee(g);
+dbg.findScripts();

js/src/vm/JSScript.h

@@ -2351,6 +2351,7 @@ class LazyScript : public gc::TenuredCell
     }
 
     JS::Compartment* compartment() const;
+    JS::Compartment* maybeCompartment() const { return compartment(); }
     Realm* realm() const;
 
     void initScript(JSScript* script);