X87: [builtins] New frame type for exits to C++ builtins.

src/x87/code-stubs-x87.cc

Index: src/x87/code-stubs-x87.cc
diff --git a/src/x87/code-stubs-x87.cc b/src/x87/code-stubs-x87.cc
index c5b7896002f6809147445c52564cf9271125b7ff..e0cc2c0f50a9d5ed4ff9c19fe1e76f336bef7822 100644
--- a/src/x87/code-stubs-x87.cc
+++ b/src/x87/code-stubs-x87.cc
@@ -1498,13 +1498,16 @@ void CEntryStub::Generate(MacroAssembler* masm) {
   // Enter the exit frame that transitions from JavaScript to C++.
   if (argv_in_register()) {
     DCHECK(!save_doubles());
+    DCHECK(!is_builtin_exit());
     __ EnterApiExitFrame(arg_stack_space);
 
     // Move argc and argv into the correct registers.
     __ mov(esi, ecx);
     __ mov(edi, eax);
   } else {
-    __ EnterExitFrame(arg_stack_space, save_doubles());
+    __ EnterExitFrame(
+        arg_stack_space, save_doubles(),
+        is_builtin_exit() ? StackFrame::BUILTIN_EXIT : StackFrame::EXIT);
   }
 
   // ebx: pointer to C function  (C callee-saved)