Ship ES2015 sloppy-mode const semantics

test/mjsunit/const-redecl.js

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+// Flags: --legacy-const
+
 // Test for const semantics.
 
 
 function CheckException(e) {
   var string = e.toString();
   var index = string.indexOf(':');
   assertTrue(index >= 0);
   var name = string.slice(0, index);
   assertTrue(string.indexOf("has already been declared") >= 0 ||
              string.indexOf("redeclaration") >= 0);
@@ skipping 179 matching lines @@
 // The const declaration stays configurable, so the declaration above goes
 // through even though the const declaration is hoisted above.
 const j = 2;
 assertEquals(2, j, "j has wrong value");
 
 var k = 1;
 try { eval('const k'); } catch(e) { }
 assertEquals(1, k, "k has wrong value");
 try { eval('const k = 10'); } catch(e) { }
 assertEquals(1, k, "k has wrong value");