Reverting 3174. Aka reapplying 3150, 3151 and 3159. Aka api accessor

src/ia32/frames-ia32.cc

Index: src/ia32/frames-ia32.cc
diff --git a/src/ia32/frames-ia32.cc b/src/ia32/frames-ia32.cc
index dea439f24b8986f7d3055929f5ad2caee0bf4a5c..5c900bedd77ca1d60b71a644eac85beb2abcb148 100644
--- a/src/ia32/frames-ia32.cc
+++ b/src/ia32/frames-ia32.cc
@@ -56,19 +56,14 @@ StackFrame::Type ExitFrame::GetStateForFramePointer(Address fp, State* state) {
   state->fp = fp;
   state->sp = sp;
   state->pc_address = reinterpret_cast<Address*>(sp - 1 * kPointerSize);
-  // Determine frame type.
-  if (Memory::Address_at(fp + ExitFrameConstants::kDebugMarkOffset) != 0) {
-    return EXIT_DEBUG;
-  } else {
-    return EXIT;
-  }
+  return EXIT;
 }
 
 
 void ExitFrame::Iterate(ObjectVisitor* v) const {
-  // Exit frames on IA-32 do not contain any pointers. The arguments
-  // are traversed as part of the expression stack of the calling
-  // frame.
+  v->VisitPointer(&code_slot());
+  // The arguments are traversed as part of the expression stack of
+  // the calling frame.
 }