Split off a separate --harmony_sloppy_let flag

src/flag-definitions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file defines all of the flags.  It is separated into different section,
 // for Debug, Release, Logging and Profiling, etc.  To add a new flag, find the
 // correct section, and use one of the DEFINE_ macros, without a trailing ';'.
 //
 // This include does not have a guard, because it is a template-style include,
 // which can be included multiple times in different modes.  It expects to have
@@ skipping 173 matching lines @@
 
 DEFINE_BOOL(legacy_const, true, "legacy semantics for const in sloppy mode")
 
 // Features that are still work in progress (behind individual flags).
 #define HARMONY_INPROGRESS(V)                                   \
   V(harmony_modules, "harmony modules")                         \
   V(harmony_array_includes, "harmony Array.prototype.includes") \
   V(harmony_regexps, "harmony regular expression extensions")   \
   V(harmony_proxies, "harmony proxies")                         \
   V(harmony_sloppy, "harmony features in sloppy mode")          \
+  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")             \
   V(harmony_sharedarraybuffer, "harmony sharedarraybuffer")     \
   V(harmony_atomics, "harmony atomics")                         \
   V(harmony_simd, "harmony simd")
 
 // Features that are complete (but still behind --harmony/es-staging flag).
 #define HARMONY_STAGED(V)                                    \
   V(harmony_tostring, "harmony toString")                    \
@@ skipping 29 matching lines @@
 
 #define FLAG_SHIPPING_FEATURES(id, description) \
   DEFINE_BOOL(id, true, "enable " #description) \
   DEFINE_NEG_NEG_IMPLICATION(harmony_shipping, id)
 HARMONY_SHIPPING(FLAG_SHIPPING_FEATURES)
 #undef FLAG_SHIPPING_FEATURES
 
 
 // Feature dependencies.
 DEFINE_IMPLICATION(harmony_unicode_regexps, harmony_unicode)
+DEFINE_IMPLICATION(harmony_sloppy_let, harmony_sloppy)
 
 
 // Flags for experimental implementation features.
 DEFINE_BOOL(compiled_keyed_generic_loads, false,
             "use optimizing compiler to generate keyed generic load stubs")
 // TODO(hpayer): We will remove this flag as soon as we have pretenuring
 // support for specific allocation sites.
 DEFINE_BOOL(pretenuring_call_new, false, "pretenure call new")
 DEFINE_BOOL(allocation_site_pretenuring, true,
             "pretenure with allocation sites")
@@ skipping 818 matching lines @@
 #undef DEFINE_ALIAS_FLOAT
 #undef DEFINE_ALIAS_ARGS
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META
 #undef FLAG_MODE_DEFINE_IMPLICATIONS
 
 #undef COMMA