Backport hash collision workaround to 3.6.

test/mjsunit/debug-evaluate-locals-optimized-double.js

Index: test/mjsunit/debug-evaluate-locals-optimized-double.js
===================================================================
--- test/mjsunit/debug-evaluate-locals-optimized-double.js	(revision 10353)
+++ test/mjsunit/debug-evaluate-locals-optimized-double.js	(working copy)
@@ -50,10 +50,12 @@
           var expected_y = (i + 1) * 2 + 2 + ((i + 1) * 2 + 2) / 100;
 
           // All frames except the bottom one has normal variables a and b.
-          assertEquals('a', frame.localName(0));
-          assertEquals('b', frame.localName(1));
-          assertEquals(expected_a, frame.localValue(0).value());
-          assertEquals(expected_b, frame.localValue(1).value());
+          var a = ('a' === frame.localName(0)) ? 0 : 1;
+          var b = 1 - a;
+          assertEquals('a', frame.localName(a));
+          assertEquals('b', frame.localName(b));
+          assertEquals(expected_a, frame.localValue(a).value());
+          assertEquals(expected_b, frame.localValue(b).value());
 
           // All frames except the bottom one has arguments variables x and y.
           assertEquals('x', frame.argumentName(0));