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

test/mjsunit/harmony/block-leave-sloppy.js

Index: test/mjsunit/harmony/block-leave-sloppy.js
diff --git a/test/mjsunit/es6/block-leave.js b/test/mjsunit/harmony/block-leave-sloppy.js
similarity index 99%
copy from test/mjsunit/es6/block-leave.js
copy to test/mjsunit/harmony/block-leave-sloppy.js
index 338631b76e0c63020b3892664da5fe788900165a..52241cfe185acc3677f502dfec83fb2f44869604 100644
--- a/test/mjsunit/es6/block-leave.js
+++ b/test/mjsunit/harmony/block-leave-sloppy.js
@@ -25,7 +25,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-"use strict";
+// Flags: --no-legacy-const --harmony-sloppy
 
 // We want to test the context chain shape.  In each of the tests cases
 // below, the outer with is to force a runtime lookup of the identifier 'x'