Fix decompiler LHS -> RHS special cases switch to cover JSOP_SETXMLNAME (597870, r=igor; CLOSED TREE).

js/src/jsopcode.cpp

@@ -2098,6 +2098,9 @@ Decompile(SprintStack *ss, jsbytecode *pc, intN nb, JSOp nextop)
                           case JSOP_GETLOCALPROP:
                             op = JSOP_GETLOCAL;
                             break;
+                          case JSOP_SETXMLNAME:
+                            op = JSOp(JSOP_GETELEM2);
+                            break;
                           default:
                             LOCAL_ASSERT(0);
                         }

js/src/tests/js1_8_5/regress/jstests.list

@@ -38,3 +38,4 @@ script regress-595365-1.js
 fails-if(!xulRuntime.shell) script regress-595365-2.js
 script regress-569464.js
 script regress-596103.js
+script regress-597870.js

js/src/tests/js1_8_5/regress/regress-597870.js

@@ -0,0 +1,22 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+try {
+  (function() {
+    __defineSetter__("x", Math.sin);
+  } ());
+} catch(e) {}
+function::x =
+  Proxy.createFunction(function() {
+      return {
+        get: function() {
+          return [];
+        }
+      };
+    } (),
+    function() {});
+
+reportCompare(0, 0, "ok");