Remove some dead fields from isolate.h

src/x87/code-stubs-x87.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_X87
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 1444 matching lines @@
 
 
 void CodeStub::GenerateFPStubs(Isolate* isolate) {
   CEntryStub save_doubles(isolate, 1, kSaveFPRegs);
   // Stubs might already be in the snapshot, detect that and don't regenerate,
   // which would lead to code stub initialization state being messed up.
   Code* save_doubles_code;
   if (!save_doubles.FindCodeInCache(&save_doubles_code)) {
     save_doubles_code = *(save_doubles.GetCode());
   }
-  isolate->set_fp_stubs_generated(true);
 }
 
 
 void CEntryStub::GenerateAheadOfTime(Isolate* isolate) {
   CEntryStub stub(isolate, 1, kDontSaveFPRegs);
   stub.GetCode();
 }
 
 
 void CEntryStub::Generate(MacroAssembler* masm) {
@@ skipping 2522 matching lines @@
                            kStackUnwindSpace, nullptr, return_value_operand,
                            NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X87