fix typos - features and closure

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 163 matching lines @@
 DEFINE_BOOL(use_strict, false, "enforce strict mode")
 DEFINE_BOOL(use_strong, false, "enforce strong mode")
 DEFINE_IMPLICATION(use_strong, use_strict)
 
 DEFINE_BOOL(strong_mode, false, "experimental strong language mode")
 DEFINE_IMPLICATION(use_strong, strong_mode)
 DEFINE_BOOL(strong_this, true, "don't allow 'this' to escape from constructors")
 
 DEFINE_BOOL(es_staging, false, "enable all completed harmony features")
 DEFINE_BOOL(harmony, false, "enable all completed harmony features")
-DEFINE_BOOL(harmony_shipping, true, "enable all shipped harmony fetaures")
+DEFINE_BOOL(harmony_shipping, true, "enable all shipped harmony features")
 DEFINE_IMPLICATION(harmony, es_staging)
 DEFINE_IMPLICATION(es_staging, harmony)
 
 DEFINE_BOOL(legacy_const, true, "legacy semantics for const in sloppy mode")
 // ES2015 const semantics are staged
 DEFINE_NEG_IMPLICATION(es_staging, legacy_const)
 
 // Features that are still work in progress (behind individual flags).
 #define HARMONY_INPROGRESS(V)                                         \
   V(harmony_modules, "harmony modules")                               \
@@ skipping 456 matching lines @@
             "make maps embedded in optimized code weak")
 DEFINE_BOOL(weak_embedded_objects_in_optimized_code, true,
             "make objects embedded in optimized code weak")
 DEFINE_BOOL(flush_code, true, "flush code that we expect not to use again")
 DEFINE_BOOL(trace_code_flushing, false, "trace code flushing progress")
 DEFINE_BOOL(age_code, true,
             "track un-executed functions to age code and flush only "
             "old code (required for code flushing)")
 DEFINE_BOOL(incremental_marking, true, "use incremental marking")
 DEFINE_BOOL(overapproximate_weak_closure, true,
-            "overapproximate weak closer to reduce atomic pause time")
+            "overapproximate weak closure to reduce atomic pause time")
 DEFINE_INT(min_progress_during_object_groups_marking, 128,
            "keep overapproximating the weak closure as long as we discover at "
            "least this many unmarked objects")
 DEFINE_INT(max_object_groups_marking_rounds, 3,
            "at most try this many times to over approximate the weak closure")
 DEFINE_BOOL(concurrent_sweeping, true, "use concurrent sweeping")
 DEFINE_BOOL(parallel_compaction, false, "use parallel compaction")
 DEFINE_BOOL(trace_incremental_marking, false,
             "trace progress of the incremental marking")
 DEFINE_BOOL(track_gc_object_stats, false,
@@ skipping 436 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