[regexp] Port RegExpExecStub to CSA (mostly)

src/objects.h

 // Copyright 2015 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.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 8581 matching lines @@
   // Only used to check that there is enough stack space
   static const int kIrregexpMaxRegisterCountIndex = kDataIndex + 4;
   // Number of captures in the compiled regexp.
   static const int kIrregexpCaptureCountIndex = kDataIndex + 5;
   // Maps names of named capture groups (at indices 2i) to their corresponding
   // capture group indices (at indices 2i + 1).
   static const int kIrregexpCaptureNameMapIndex = kDataIndex + 6;
 
   static const int kIrregexpDataSize = kIrregexpCaptureNameMapIndex + 1;
 
-  // Offsets directly into the data fixed array.
-  static const int kDataTagOffset =
-      FixedArray::kHeaderSize + kTagIndex * kPointerSize;
-  static const int kDataOneByteCodeOffset =
-      FixedArray::kHeaderSize + kIrregexpLatin1CodeIndex * kPointerSize;
-  static const int kDataUC16CodeOffset =
-      FixedArray::kHeaderSize + kIrregexpUC16CodeIndex * kPointerSize;
-  static const int kIrregexpCaptureCountOffset =
-      FixedArray::kHeaderSize + kIrregexpCaptureCountIndex * kPointerSize;
-
   // In-object fields.
   static const int kLastIndexFieldIndex = 0;
   static const int kInObjectFieldCount = 1;
 
   // The uninitialized value for a regexp code object.
   static const int kUninitializedValue = -1;
 
   // The compilation error value for the regexp code object. The real error
   // object is in the saved code field.
   static const int kCompilationErrorValue = -2;
@@ skipping 2959 matching lines @@
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #include "src/objects/object-macros-undef.h"
 
 #endif  // V8_OBJECTS_H_