deps: backport 066747e from upstream V8

This backport fixes a performance pathology in how arrays grow/shrink. Fixes: #3538 V8-Commit: v8/v8@066747e Original commit message: Make sure that NormalizeElements and ShouldConvertToFastElements are … …based on the same values BUG=v8:4518 LOG=n Review URL: https://codereview.chromium.org/1472293002 Cr-Commit-Position: refs/heads/master@{#32265}
7ccce421cac1eb2ec5b92a31b3f746317e7496d9
commit 7ccce421cac1eb2ec5b92a31b3f746317e7496d9
diff --git a/deps/v8/src/elements.cc b/deps/v8/src/elements.cc
@@ -1071,13 +1071,18 @@ class FastElementsAccessor
       }
       int num_used = 0;
       for (int i = 0; i < backing_store->length(); ++i) {
-        if (!backing_store->is_the_hole(i)) ++num_used;
-        // Bail out early if more than 1/4 is used.
-        if (4 * num_used > backing_store->length()) break;
-      }
-      if (4 * num_used <= backing_store->length()) {
-        JSObject::NormalizeElements(obj);
+        if (!backing_store->is_the_hole(i)) {
+          ++num_used;
+          // Bail out if a number dictionary wouldn't be able to save at least
+          // 75% space.
+          if (4 * SeededNumberDictionary::ComputeCapacity(num_used) *
+                  SeededNumberDictionary::kEntrySize >
+              backing_store->length()) {
+            return;
+          }
+        }
       }
+      JSObject::NormalizeElements(obj);
     }
   }
 

diff --git a/deps/v8/src/objects.cc b/deps/v8/src/objects.cc
@@ -12226,6 +12226,8 @@ static bool ShouldConvertToFastElements(JSObject* object,
 
   uint32_t dictionary_size = static_cast<uint32_t>(dictionary->Capacity()) *
                              SeededNumberDictionary::kEntrySize;
+
+  // Turn fast if the dictionary only saves 50% space.
   return 2 * dictionary_size >= *new_capacity;
 }