A64: Preserve/restore the FP registers in the exit frame when required.

src/a64/frames-a64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 43 matching lines @@
     CPURegList::GetSafepointSavedRegisters().Count();
 
 class EntryFrameConstants : public AllStatic {
  public:
   static const int kCallerFPOffset      = -3 * kPointerSize;
 };
 
 
 class ExitFrameConstants : public AllStatic {
  public:
-  static const int kCallerSPDisplacement  =  2 * kPointerSize;
-  static const int kCallerPCOffset        =  1 * kPointerSize;
-  static const int kCallerFPOffset        =  0 * kPointerSize;   // <- fp
-  static const int kSPOffset              = -1 * kPointerSize;
-  static const int kCodeOffset            = -2 * kPointerSize;
-  static const int kCallerSavedRegsOffset = -3 * kPointerSize;
+  static const int kCallerSPDisplacement =  2 * kPointerSize;
+  static const int kCallerPCOffset       =  1 * kPointerSize;
+  static const int kCallerFPOffset       =  0 * kPointerSize;   // <- fp
+  static const int kSPOffset             = -1 * kPointerSize;
+  static const int kCodeOffset           = -2 * kPointerSize;
+  static const int kLastExitFrameField   = kCodeOffset;
 };
 
 
 class JavaScriptFrameConstants : public AllStatic {
  public:
   // FP-relative.
   static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
 
   // There are two words on the stack (saved fp and saved lr) between fp and
   // the arguments.
@@ skipping 35 matching lines @@
 
 inline Object* JavaScriptFrame::function_slot_object() const {
   const int offset = JavaScriptFrameConstants::kFunctionOffset;
   return Memory::Object_at(fp() + offset);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_A64_FRAMES_A64_H_