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

src/ia32/assembler-ia32.h

Index: src/ia32/assembler-ia32.h
diff --git a/src/ia32/assembler-ia32.h b/src/ia32/assembler-ia32.h
index 149ac22c4eb8b2886a9c32c9c9f4fddfd6019a30..4e542d72c9b04a60a5cefc90266c852d2073ecc0 100644
--- a/src/ia32/assembler-ia32.h
+++ b/src/ia32/assembler-ia32.h
@@ -124,9 +124,6 @@ struct Register {
     Register r = {code};
     return r;
   }
-  const char* ToString();
-  bool IsAllocatable(RegisterConfiguration::CompilerSelector compiler =
-                         RegisterConfiguration::CRANKSHAFT) const;
   bool is_valid() const { return 0 <= reg_code && reg_code < kNumRegisters; }
   bool is(Register reg) const { return reg_code == reg.reg_code; }
   int code() const {
@@ -168,8 +165,6 @@ struct XMMRegister {
     return result;
   }
 
-  bool IsAllocatable(RegisterConfiguration::CompilerSelector compiler =
-                         RegisterConfiguration::CRANKSHAFT) const;
   bool is_valid() const { return 0 <= reg_code && reg_code < kMaxNumRegisters; }
 
   int code() const {
@@ -179,8 +174,6 @@ struct XMMRegister {
 
   bool is(XMMRegister reg) const { return reg_code == reg.reg_code; }
 
-  const char* ToString();
-
   int reg_code;
 };