deps: add back no-op harmony shipping flags

Add back the no-op harmony shipping flags that were removed in V8 5.1
to increase compatibility with V8 5.0 that we had been shipping before
v6.5.0. These flags do nothing.

Fixes: #8388
Ref: #8395
PR-URL: #8445
Reviewed-By: addaleax - Anna Henningsen <anna@addaleax.net>
Reviewed-By: thealphanerd - Myles Borins <myles.borins@gmail.com>
Reviewed-By: jasnell - James M Snell <jasnell@gmail.com>
Reviewed-By: evanlucas - Evan Lucas <evanlucas@me.com>
Reviewed-By: targos - Michaël Zasso <mic.besace@gmail.com>
Reviewed-By: bnoordhuis - Ben Noordhuis <info@bnoordhuis.nl>

deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 5
 #define V8_MINOR_VERSION 1
 #define V8_BUILD_NUMBER 281
-#define V8_PATCH_LEVEL 82
+#define V8_PATCH_LEVEL 83
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

deps/v8/src/flag-definitions.h

@@ -235,6 +235,20 @@ DEFINE_IMPLICATION(es_staging, move_object_start)
 // and associated tests are moved from the harmony directory to the appropriate
 // esN directory.
 
+// no-op flags added back for V8 5.0 compatibility for Node.js v6.x.
+#define NODE_NOP_HARMONY_FEATURES(V)                                      \
+  V(harmony_default_parameters, "harmony default parameters")             \
+  V(harmony_destructuring_assignment, "harmony destructuring assignment") \
+  V(harmony_destructuring_bind, "harmony destructuring bind")             \
+  V(harmony_regexps, "harmony regular expression extensions")             \
+  V(harmony_proxies, "harmony proxies")                                   \
+  V(harmony_reflect, "harmony Reflect API")                               \
+  V(harmony_tostring, "harmony toString")
+
+#define FLAG_NODE_NOP_HARMONY_FEATURES(id, description) \
+  DEFINE_BOOL(id, true, "nop flag for " #description)
+NODE_NOP_HARMONY_FEATURES(FLAG_NODE_NOP_HARMONY_FEATURES)
+#undef FLAG_NODE_NOP_HARMONY_FEATURES
 
 #define FLAG_INPROGRESS_FEATURES(id, description) \
   DEFINE_BOOL(id, false, "enable " #description " (in progress)")