[regexp] Remove remainder of native RegExpExecStub

src/regexp/arm64/regexp-macro-assembler-arm64.h

Index: src/regexp/arm64/regexp-macro-assembler-arm64.h
diff --git a/src/regexp/arm64/regexp-macro-assembler-arm64.h b/src/regexp/arm64/regexp-macro-assembler-arm64.h
index 5db220e96251659a7c57fded4f5c8e086ae36462..614be624a9332077fe3b1f34c684ee3e1b725577 100644
--- a/src/regexp/arm64/regexp-macro-assembler-arm64.h
+++ b/src/regexp/arm64/regexp-macro-assembler-arm64.h
@@ -109,9 +109,8 @@ class RegExpMacroAssemblerARM64: public NativeRegExpMacroAssembler {
   // Return address.
   // It is placed above the 11 callee-saved registers.
   static const int kReturnAddress = kCalleeSavedRegisters + 11 * kPointerSize;
-  static const int kSecondaryReturnAddress = kReturnAddress + kPointerSize;
   // Stack parameter placed by caller.
-  static const int kIsolate = kSecondaryReturnAddress + kPointerSize;
+  static const int kIsolate = kReturnAddress + kPointerSize;
 
   // Below the frame pointer.
   // Register parameters stored by setup code.