[turbofan] Fix unified stack slots for embedded constant pools.

src/frames.h

Index: src/frames.h
diff --git a/src/frames.h b/src/frames.h
index 05c0a3548918036457e46b0d16de4cd9403a57b7..fdf91246c38982a596dc86564631f142678cb918 100644
--- a/src/frames.h
+++ b/src/frames.h
@@ -126,6 +126,7 @@ class StandardFrameConstants : public AllStatic {
   static const int kFixedSlotCountAboveFp =
       kFixedFrameSizeAboveFp / kPointerSize;
   static const int kFixedSlotCount = kFixedFrameSize / kPointerSize;
+  static const int kCPSlotCount = kCPSlotSize / kPointerSize;
   static const int kExpressionsOffset = -3 * kPointerSize - kCPSlotSize;
   static const int kMarkerOffset = -2 * kPointerSize - kCPSlotSize;
   static const int kContextOffset = -1 * kPointerSize - kCPSlotSize;