Revert of Canonicalize handles for optimized compilation.

src/string-builder.cc

 // Copyright 2014 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.
 
 #include "src/string-builder.h"
 
 #include "src/isolate-inl.h"
 #include "src/objects-inl.h"
 
 namespace v8 {
@@ skipping 34 matching lines @@
 }
 
 
 IncrementalStringBuilder::IncrementalStringBuilder(Isolate* isolate)
     : isolate_(isolate),
       encoding_(String::ONE_BYTE_ENCODING),
       overflowed_(false),
       part_length_(kInitialPartLength),
       current_index_(0) {
   // Create an accumulator handle starting with the empty string.
-  accumulator_ = Handle<String>::New(isolate->heap()->empty_string(), isolate);
+  accumulator_ = Handle<String>(isolate->heap()->empty_string(), isolate);
   current_part_ =
       factory()->NewRawOneByteString(part_length_).ToHandleChecked();
 }
 
 
 void IncrementalStringBuilder::Accumulate(Handle<String> new_part) {
   Handle<String> new_accumulator;
   if (accumulator()->length() + new_part->length() > String::kMaxLength) {
     // Set the flag and carry on. Delay throwing the exception till the end.
     new_accumulator = factory()->empty_string();
@@ skipping 35 matching lines @@
 
 
 void IncrementalStringBuilder::AppendString(Handle<String> string) {
   ShrinkCurrentPart();
   part_length_ = kInitialPartLength;  // Allocate conservatively.
   Extend();  // Attach current part and allocate new part.
   Accumulate(string);
 }
 }  // namespace internal
 }  // namespace v8