Config double register number as 1 for X87 Turbofan.

src/mips64/assembler-mips64.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 200 matching lines @@
   static const int kNumReservedRegisters = 2;
   static const int kMaxNumAllocatableRegisters = kMaxNumRegisters / 2 -
       kNumReservedRegisters;
 
   inline static int NumRegisters();
   inline static int NumAllocatableRegisters();
 
   // TODO(turbofan): Proper support for float32.
   inline static int NumAllocatableAliasedRegisters();
 
+  static int NumAllocatableRegistersForTurbo() {
+    return kMaxNumAllocatableRegisters;
+  }
+
+  static int NumAllocatableAliasedRegistersForTurbo() {
+    return NumAllocatableAliasedRegisters();
+  }
+
   inline static int ToAllocationIndex(FPURegister reg);
   static const char* AllocationIndexToString(int index);
 
   static FPURegister FromAllocationIndex(int index) {
     DCHECK(index >= 0 && index < kMaxNumAllocatableRegisters);
     return from_code(index * 2);
   }
 
   static FPURegister from_code(int code) {
     FPURegister r = { code };
@@ skipping 1247 matching lines @@
 class EnsureSpace BASE_EMBEDDED {
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_MIPS_H_