Reland r13275 and 13276 (Remove most uses of StringInputBuffer).

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 9f086b21a2e0dcd367b1b06577d900b0c6ca5190..b3cfb4327db2085b1f0934de8240e9f101de2e5e 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -75,7 +75,7 @@ class PreallocatedMemoryThread;
 class RegExpStack;
 class SaveContext;
 class UnicodeCache;
-class StringInputBuffer;
+class ConsStringIteratorOp;
 class StringTracker;
 class StubCache;
 class ThreadManager;
@@ -881,7 +881,7 @@ class Isolate {
     return inner_pointer_to_code_cache_;
   }
 
-  StringInputBuffer* write_input_buffer() { return write_input_buffer_; }
+  ConsStringIteratorOp* write_iterator() { return write_iterator_; }
 
   GlobalHandles* global_handles() { return global_handles_; }
 
@@ -903,16 +903,16 @@ class Isolate {
     return &jsregexp_canonrange_;
   }
 
-  StringInputBuffer* objects_string_compare_buffer_a() {
-    return &objects_string_compare_buffer_a_;
+  ConsStringIteratorOp* objects_string_compare_iterator_a() {
+    return &objects_string_compare_iterator_a_;
   }
 
-  StringInputBuffer* objects_string_compare_buffer_b() {
-    return &objects_string_compare_buffer_b_;
+  ConsStringIteratorOp* objects_string_compare_iterator_b() {
+    return &objects_string_compare_iterator_b_;
   }
 
-  StaticResource<StringInputBuffer>* objects_string_input_buffer() {
-    return &objects_string_input_buffer_;
+  StaticResource<ConsStringIteratorOp>* objects_string_iterator() {
+    return &objects_string_iterator_;
   }
 
   RuntimeState* runtime_state() { return &runtime_state_; }
@@ -1225,7 +1225,7 @@ class Isolate {
   PreallocatedStorage free_list_;
   bool preallocated_storage_preallocated_;
   InnerPointerToCodeCache* inner_pointer_to_code_cache_;
-  StringInputBuffer* write_input_buffer_;
+  ConsStringIteratorOp* write_iterator_;
   GlobalHandles* global_handles_;
   ContextSwitcher* context_switcher_;
   ThreadManager* thread_manager_;
@@ -1236,9 +1236,9 @@ class Isolate {
   StringTracker* string_tracker_;
   unibrow::Mapping<unibrow::Ecma262UnCanonicalize> jsregexp_uncanonicalize_;
   unibrow::Mapping<unibrow::CanonicalizationRange> jsregexp_canonrange_;
-  StringInputBuffer objects_string_compare_buffer_a_;
-  StringInputBuffer objects_string_compare_buffer_b_;
-  StaticResource<StringInputBuffer> objects_string_input_buffer_;
+  ConsStringIteratorOp objects_string_compare_iterator_a_;
+  ConsStringIteratorOp objects_string_compare_iterator_b_;
+  StaticResource<ConsStringIteratorOp> objects_string_iterator_;
   unibrow::Mapping<unibrow::Ecma262Canonicalize>
       regexp_macro_assembler_canonicalize_;
   RegExpStack* regexp_stack_;