Introduce collective --harmony flag.

test/mjsunit/harmony/block-scoping.js

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-// Flags: --allow-natives-syntax --harmony-block-scoping
+// Flags: --allow-natives-syntax --harmony-scoping
 // Test functionality of block scopes.
 
 // Hoisting of var declarations.
 function f1() {
   {
     var x = 1;
     var y;
   }
   assertEquals(1, x)
   assertEquals(undefined, y)
@@ skipping 168 matching lines @@
     let_accessors[i] = function() { return x; }
     var_accessors[i] = function() { return y; }
   }
   for (var j = 0; j < 10; j++) {
     y = j + 10;
     assertEquals(j, let_accessors[j]());
     assertEquals(y, var_accessors[j]());
   }
 }
 f8();