VM: Simplify irregexp entry stub.

runtime/vm/regexp_assembler.h

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_REGEXP_ASSEMBLER_H_
 #define VM_REGEXP_ASSEMBLER_H_
 
 #include "vm/assembler.h"
 #include "vm/intermediate_language.h"
 #include "vm/object.h"
@@ skipping 81 matching lines @@
   // The implementation must be able to handle at least:
   static const intptr_t kMaxRegister = (1 << 16) - 1;
   static const intptr_t kMaxCPOffset = (1 << 15) - 1;
   static const intptr_t kMinCPOffset = -(1 << 15);
 
   static const intptr_t kTableSizeBits = 7;
   static const intptr_t kTableSize = 1 << kTableSizeBits;
   static const intptr_t kTableMask = kTableSize - 1;
 
   enum {
-    kParamStringIndex = 0,
+    kParamRegExpIndex = 0,
+    kParamStringIndex,
     kParamStartOffsetIndex,
     kParamCount
   };
 
   enum IrregexpImplementation {
     kBytecodeImplementation,
     kIRImplementation
   };
 
   explicit RegExpMacroAssembler(Zone* zone);
@@ skipping 125 matching lines @@
 
  private:
   bool slow_safe_compiler_;
   bool global_mode_;
   Zone* zone_;
 };
 
 }  // namespace dart
 
 #endif  // VM_REGEXP_ASSEMBLER_H_