[X87] [Ignition] Fix V8 x87 code generation bugs when Ingition was enabled.

src/x87/builtins-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-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 636 matching lines @@
   __ mov(ecx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
   __ mov(ecx, FieldOperand(ecx, SharedFunctionInfo::kCodeOffset));
   __ lea(ecx, FieldOperand(ecx, Code::kHeaderSize));
   __ mov(FieldOperand(edi, JSFunction::kCodeEntryOffset), ecx);
   __ RecordWriteCodeEntryField(edi, ecx, ebx);
   __ jmp(ecx);
 }
 
 
 void Builtins::Generate_InterpreterExitTrampoline(MacroAssembler* masm) {
+  // Interpreter handler is turbofanned code, need to reset the FPU before
+  // return
+  __ fninit();
+
   // The return value is in accumulator, which is already in eax.
 
   // Leave the frame (also dropping the register file).
   __ leave();
 
   // Drop receiver + arguments and return.
   __ mov(ebx, FieldOperand(kInterpreterBytecodeArrayRegister,
                            BytecodeArray::kParameterSizeOffset));
   __ pop(ecx);
   __ add(esp, ebx);
@@ skipping 2268 matching lines @@
   // And "return" to the OSR entry point of the function.
   __ ret(0);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X87