Bug 795765 - Fix "used but never defined" warning for JSObject::asString(). r=jwalden.

js/src/ion/CodeGenerator.cpp

@@ -22,6 +22,11 @@ using namespace js::ion;
 namespace js {
 namespace ion {
 
+StringObject *
+MNewStringObject::templateObj() const {
+    return &templateObj_->asString();
+}
+
 CodeGenerator::CodeGenerator(MIRGenerator *gen, LIRGraph &graph)
   : CodeGeneratorSpecific(gen, graph)
 {

js/src/ion/MIR.h

@@ -5311,9 +5311,9 @@ class MNewStringObject :
     MDefinition *input() const {
         return getOperand(0);
     }
-    StringObject *templateObj() const {
-        return &templateObj_->asString();
-    }
+
+    StringObject *templateObj() const;
+
     TypePolicy *typePolicy() {
         return this;
     }