[turbofan] Add CalleeSavedFPRegisters to CallDescriptor.

src/compiler/x64/linkage-x64.cc

 // Copyright 2014 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.
 
 #include "src/assembler.h"
 #include "src/code-stubs.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/linkage-impl.h"
 #include "src/zone.h"
 
@@ skipping 15 matching lines @@
   static Register RuntimeCallFunctionReg() { return rbx; }
   static Register RuntimeCallArgCountReg() { return rax; }
   static RegList CCalleeSaveRegisters() {
     if (kWin64) {
       return rbx.bit() | rdi.bit() | rsi.bit() | r12.bit() | r13.bit() |
              r14.bit() | r15.bit();
     } else {
       return rbx.bit() | r12.bit() | r13.bit() | r14.bit() | r15.bit();
     }
   }
+  static RegList CCalleeSaveFPURegisters() {
+    // TODO(palfia): finish.
+    return 0;
+  }

[paul.l..., 2015/06/15 23:05:17]

Per JSEntryStub, xmm6 thru xmm15 are callee-saved, but _only_ on WIN64. 

[akos.palfi.imgtec, 2015/06/22 17:33:20]

Done.

   static Register CRegisterParameter(int i) {
     if (kWin64) {
       static Register register_parameters[] = {rcx, rdx, r8, r9};
       return register_parameters[i];
     } else {
       static Register register_parameters[] = {rdi, rsi, rdx, rcx, r8, r9};
       return register_parameters[i];
     }
   }
   static int CRegisterParametersLength() { return kWin64 ? 4 : 6; }
@@ skipping 27 matching lines @@
 
 
 CallDescriptor* Linkage::GetSimplifiedCDescriptor(Zone* zone,
                                                   const MachineSignature* sig) {
   return LH::GetSimplifiedCDescriptor(zone, sig);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8