[ignition] BytecodeGraphBuilder: Merge correct environment in try block

test/mjsunit/regress/regress-crbug-651403-global.js

Index: test/mjsunit/regress/regress-crbug-651403-global.js
diff --git a/test/mjsunit/ignition/regress-629792-source-position-on-jump.js b/test/mjsunit/regress/regress-crbug-651403-global.js
similarity index 52%
copy from test/mjsunit/ignition/regress-629792-source-position-on-jump.js
copy to test/mjsunit/regress/regress-crbug-651403-global.js
index f87caf681a00af7d47b878013e1344f1cfd94c72..776bdcfc873d19ce6e92645564288da9c9dccf87 100644
--- a/test/mjsunit/ignition/regress-629792-source-position-on-jump.js
+++ b/test/mjsunit/regress/regress-crbug-651403-global.js
@@ -2,13 +2,19 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-function f(t) {
-  var f = t || this;
-  for (var i in t) {
-    for (var j in t) {
-      (j);
-      continue;
+// Flags: --ignition-staging --turbo --always-opt
+
+x = "";
+
+function f () {
+  function g() {
+    try {
+      eval('');
+      return x;
+    } catch(e) {
     }
   }
+  return g();
 }
+
 f();