Shorten live ranges of argument subexpressions.

test/mjsunit/compiler/regress-stacktrace.js

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 25 matching lines @@
   throw new Error("urg");
 }
 
 try {
  one();
 } catch (e) {
   var stack = e.stack.toString();
   var p3 = stack.indexOf("at three");
   var p2 = stack.indexOf("at two");
   var p1 = stack.indexOf("at one");
-  assertTrue(p3 != -1);
-  assertTrue(p2 != -1);
-  assertTrue(p1 != -1);
-  assertTrue(p3 < p2);
-  assertTrue(p2 < p1);
   print(stack);
+  assertTrue(p3 != -1, "p3 != -1");
+  assertTrue(p2 != -1, "p2 != -1");
+  assertTrue(p1 != -1, "p1 != -1");
+  assertTrue(p3 < p2, "p3 < p2");
+  assertTrue(p2 < p1, "p2 < p1");
 }