[RegisterConfiguration] Streamline access to arch defaults, simplify Registers.

src/arm64/assembler-arm64.h

 // Copyright 2013 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_ARM64_ASSEMBLER_ARM64_H_
 #define V8_ARM64_ASSEMBLER_ARM64_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 136 matching lines @@
     DCHECK(IsValidOrNone());
   }
 
   Register(const Register& r) {  // NOLINT(runtime/explicit)
     reg_code = r.reg_code;
     reg_size = r.reg_size;
     reg_type = r.reg_type;
     DCHECK(IsValidOrNone());
   }
 
-  const char* ToString();
-  bool IsAllocatable(RegisterConfiguration::CompilerSelector compiler =
-                         RegisterConfiguration::CRANKSHAFT) const;
   bool IsValid() const {
     DCHECK(IsRegister() || IsNone());
     return IsValidRegister();
   }
 
   static Register XRegFromCode(unsigned code);
   static Register WRegFromCode(unsigned code);
 
   // Start of V8 compatibility section ---------------------
   // These memebers are necessary for compilation.
@@ skipping 55 matching lines @@
     DCHECK(IsValidOrNone());
   }
 
   FPRegister(const FPRegister& r) {  // NOLINT(runtime/explicit)
     reg_code = r.reg_code;
     reg_size = r.reg_size;
     reg_type = r.reg_type;
     DCHECK(IsValidOrNone());
   }
 
-  const char* ToString();
-  bool IsAllocatable(RegisterConfiguration::CompilerSelector compiler =
-                         RegisterConfiguration::CRANKSHAFT) const;
   bool IsValid() const {
     DCHECK(IsFPRegister() || IsNone());
     return IsValidFPRegister();
   }
 
   static FPRegister SRegFromCode(unsigned code);
   static FPRegister DRegFromCode(unsigned code);
 
   // Start of V8 compatibility section ---------------------
   static const int kMaxNumRegisters = kNumberOfFPRegisters;
@@ skipping 1991 matching lines @@
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBufferSpace();
   }
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM64_ASSEMBLER_ARM64_H_