Implement tracking and optimizations of packed arrays.

src/runtime.h

Index: src/runtime.h
diff --git a/src/runtime.h b/src/runtime.h
index e27854b70123571ce96229d4a89e68aacbb238cb..af8e1c526620463138983d75e69492ec50b1c5ee 100644
--- a/src/runtime.h
+++ b/src/runtime.h
@@ -364,9 +364,11 @@ namespace internal {
   F(IS_VAR, 1, 1) \
   \
   /* expose boolean functions from objects-inl.h */ \
-  F(HasFastSmiOnlyElements, 1, 1) \
-  F(HasFastElements, 1, 1) \
+  F(HasFastSmiElements, 1, 1) \
+  F(HasFastSmiOrObjectElements, 1, 1) \
+  F(HasFastObjectElements, 1, 1) \
   F(HasFastDoubleElements, 1, 1) \
+  F(HasFastHoleyElements, 1, 1) \
   F(HasDictionaryElements, 1, 1) \
   F(HasExternalPixelElements, 1, 1) \
   F(HasExternalArrayElements, 1, 1) \