Revert "Added ability to lock strings to prevent their representation or encoding from changing."

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 105dfd101edcf5033a603870a0c16319d2b8f1c2..68047754c87a74a68405694a947ed7cf36f92d2c 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -2812,8 +2812,7 @@ MaybeObject* JSObject::SetLocalPropertyIgnoreAttributes(
         attributes);
   }
 
-  // Unlike SetLocalProperty, we ignore the prototype chain and
-  // any accessors in it.
+  // Check for accessor in prototype chain removed here in clone.
   if (!result.IsFound()) {
     // Neither properties nor transitions found.
     return AddProperty(name, value, attributes, kNonStrictMode);
@@ -10214,8 +10213,6 @@ class SubStringAsciiSymbolKey : public HashTableKey {
     ASSERT(length_ >= 0);
     ASSERT(from_ + length_ <= string_->length());
     StringHasher hasher(length_);
-    AssertNoAllocation no_alloc;
-    const char* chars = string_->GetChars() + from_;
 
     // Very long strings have a trivial hash that doesn't inspect the
     // string contents.
@@ -10226,14 +10223,16 @@ class SubStringAsciiSymbolKey : public HashTableKey {
       // Do the iterative array index computation as long as there is a
       // chance this is an array index.
       while (i < length_ && hasher.is_array_index()) {
-        hasher.AddCharacter(static_cast<uc32>(chars[i]));
+        hasher.AddCharacter(static_cast<uc32>(
+            string_->SeqAsciiStringGet(i + from_)));
         i++;
       }
 
       // Process the remaining characters without updating the array
       // index.
       while (i < length_) {
-        hasher.AddCharacterNoIndex(static_cast<uc32>(chars[i]));
+        hasher.AddCharacterNoIndex(static_cast<uc32>(
+            string_->SeqAsciiStringGet(i + from_)));
         i++;
       }
       hash_field_ = hasher.GetHashField();