Remove support for legacy const, part 1

test/mjsunit/regress/regress-1178598.js

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-// Flags: --legacy-const
-
 // Regression test cases for issue 1178598.
 
-// Make sure const-initialization doesn't conflict
-// with heap-allocated locals for catch variables.
-var value = (function(){
-  try { } catch(e) {
-    // Force the 'e' variable to be heap-allocated
-    // by capturing it in a function closure.
-    (function() { e; });
-  }
-  // Make sure the two definitions of 'e' do
-  // not conflict in any way.
-  eval("const e=1");
-  return e;
-})();
-
-assertEquals(1, value);
-
-
 
 // Make sure that catch variables can be accessed using eval.
 var value = (function() {
   var result;
   try {
     throw 42;
   } catch (e) {
     result = eval("e");
   }
   return result;
@@ skipping 22 matching lines @@
   try {
     eval("e");
     assertTrue(false);  // should throw exception
   } catch(exception) {
     assertTrue(exception instanceof ReferenceError);
     return result;
   }
 })();
 
 assertEquals(87, value);