[Interpreter] Collect type feedback for subtract operation and pass it to turbofan.

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index 2bfb1eb84e258a0ed59d46a1d4f463d0624a9c9c..6dc90fb9fe7cdbd889fb628b3b26031dca7895b2 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -1150,6 +1150,11 @@ inline uint32_t ObjectHash(Address address) {
                                kPointerSizeLog2);
 }
 
+class BinaryOperationFeedback {
+ public:
+  enum { kNone = 0x00, kSignedSmall = 0x01, kNumber = 0x3, kAny = 0x7 };

[rmcilroy, 2016/08/08 08:27:31]

Nit - comment that the values are important to allow combining by binary ORing.

[mythria, 2016/08/09 00:51:59]

Done.

+};
+
 }  // namespace internal
 }  // namespace v8