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

src/x87/builtins-x87.cc

Index: src/x87/builtins-x87.cc
diff --git a/src/x87/builtins-x87.cc b/src/x87/builtins-x87.cc
index 46495919c8193d08c1b847a4f0a303cc9bb640cd..319f99a54f0620724fc7a7dcb986ac2c0037ff7f 100644
--- a/src/x87/builtins-x87.cc
+++ b/src/x87/builtins-x87.cc
@@ -654,6 +654,10 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
 
 
 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).