Revert of Stage sloppy let

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 0ca6f8137f6198060e6833bbdee185a5f47c4a89..19769f16047c29f7cc0e625a0ef8718138f3259b 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -193,6 +193,7 @@
   V(harmony_regexps, "harmony regular expression extensions")         \
   V(harmony_proxies, "harmony proxies")                               \
   V(harmony_sloppy_function, "harmony sloppy function block scoping") \
+  V(harmony_sloppy_let, "harmony let in sloppy mode")                 \
   V(harmony_unicode_regexps, "harmony unicode regexps")               \
   V(harmony_reflect, "harmony Reflect API")                           \
   V(harmony_destructuring, "harmony destructuring")                   \
@@ -206,8 +207,7 @@
   V(harmony_tostring, "harmony toString")                       \
   V(harmony_concat_spreadable, "harmony isConcatSpreadable")    \
   V(harmony_rest_parameters, "harmony rest parameters")         \
-  V(harmony_sloppy, "harmony features in sloppy mode")          \
-  V(harmony_sloppy_let, "harmony let in sloppy mode")
+  V(harmony_sloppy, "harmony features in sloppy mode")
 
 // Features that are shipping (turned on by default, but internal flag remains).
 #define HARMONY_SHIPPING(V)                                     \