X87: [turbofan] Add CalleeSavedFPRegisters to CallDescriptor.

src/compiler/x87/linkage-x87.cc

Index: src/compiler/x87/linkage-x87.cc
diff --git a/src/compiler/x87/linkage-x87.cc b/src/compiler/x87/linkage-x87.cc
index e4606de4f29979f2e1ebeccd774a74838771829a..69e1b3de59c31bb4a989b9b4c8bd861363f5f65d 100644
--- a/src/compiler/x87/linkage-x87.cc
+++ b/src/compiler/x87/linkage-x87.cc
@@ -22,6 +22,7 @@ struct X87LinkageHelperTraits {
   static RegList CCalleeSaveRegisters() {
     return esi.bit() | edi.bit() | ebx.bit();
   }
+  static RegList CCalleeSaveFPRegisters() { return 0; }
   static Register CRegisterParameter(int i) { return no_reg; }
   static int CRegisterParametersLength() { return 0; }
   static int CStackBackingStoreLength() { return 0; }