[es6] Initial support for let/const bindings in sloppy mode

test/mjsunit/harmony/block-let-crankshaft-sloppy.js

Index: test/mjsunit/harmony/block-let-crankshaft-sloppy.js
diff --git a/test/mjsunit/es6/block-let-crankshaft.js b/test/mjsunit/harmony/block-let-crankshaft-sloppy.js
similarity index 99%
copy from test/mjsunit/es6/block-let-crankshaft.js
copy to test/mjsunit/harmony/block-let-crankshaft-sloppy.js
index 9cfdf847fcccf50aa54bdab3b6d590401c8ec0ed..ed8c815f3b8468d3736695c7138219bb77469d26 100644
--- a/test/mjsunit/es6/block-let-crankshaft.js
+++ b/test/mjsunit/harmony/block-let-crankshaft-sloppy.js
@@ -26,8 +26,7 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
-
-"use strict";
+// Flags: --no-legacy-const --harmony-sloppy
 
 // Check that the following functions are optimizable.
 var functions = [ f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f12, f13, f14,