Attempt at pre-calculating replace regexp matches.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index b3fe448463aa425c4b6b2cf2d1516f2798254bff..b3c88a64b1c46b42c8c42f3c8ae1d209a82bc1c2 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4617,6 +4617,9 @@ class JSArray: public JSObject {
   // Uses handles.  Ensures that the fixed array backing the JSArray has at
   // least the stated size.
   inline void EnsureSize(int minimum_size_of_backing_fixed_array);
+  // As ensure size, but sets length to the required size and ensures that
+  // holes are written above this length.
+  inline void Resize(int minimum_size_of_backing_fixed_array);
 
   // Dispatched behavior.
 #ifdef DEBUG