Fix asserts and GC unsafeness in stub generation, bug=1689.

src/ia32/code-stubs-ia32.cc

 // Copyright 2011 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4275 matching lines @@
   __ jmp(adaptor, RelocInfo::CODE_TARGET);
 }
 
 
 bool CEntryStub::NeedsImmovableCode() {
   return false;
 }
 
 
 bool CEntryStub::CompilingCallsToThisStubIsGCSafe() {
-  return !save_doubles_ && result_size_ == 1;
+  return (!save_doubles_ || ISOLATE->fp_stubs_generated()) &&
+          result_size_ == 1;
 }
 
 
 void CodeStub::GenerateStubsAheadOfTime() {
 }
 
 
+void CodeStub::GenerateFPStubs() {
+  CEntryStub save_doubles(1);
+  save_doubles.SaveDoubles();
+  Handle<Code> code = save_doubles.GetCode();
+  code->GetIsolate()->set_fp_stubs_generated(true);
+}
+
+
 void CEntryStub::GenerateThrowTOS(MacroAssembler* masm) {
   __ Throw(eax);
 }
 
 
 void CEntryStub::GenerateCore(MacroAssembler* masm,
                               Label* throw_normal_exception,
                               Label* throw_termination_exception,
                               Label* throw_out_of_memory_exception,
                               bool do_gc,
@@ skipping 2213 matching lines @@
   __ Drop(1);
   __ ret(2 * kPointerSize);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32