Add boolean runtime checks for different element kinds.

This will be used for Array.p.sort benchmarks to ensure that the
arrays will have the correct element kind.

R=cbruni@chromium.org, jgruber@chromium.org

Bug: v8:7382
Change-Id: I4fe58d97d7f18fd193d4432964cf6b4f5335e0e7
Reviewed-on: https://chromium-review.googlesource.com/1004754
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52511}

src/runtime/runtime-object.cc

@@ -874,6 +874,24 @@ RUNTIME_FUNCTION(Runtime_HasFastPackedElements) {
       IsFastPackedElementsKind(obj->map()->elements_kind()));
 }
 
+#define RUNTIME_FUNCTION_CHECK_ELEMENT_KIND(Name, Kind)                     \
+  RUNTIME_FUNCTION(Runtime_##Name) {                                        \
+    SealHandleScope shs(isolate);                                           \
+    DCHECK_EQ(1, args.length());                                            \
+    CONVERT_ARG_CHECKED(HeapObject, obj, 0);                                \
+    return isolate->heap()->ToBoolean(obj->map()->elements_kind() == Kind); \
+  }
+
+RUNTIME_FUNCTION_CHECK_ELEMENT_KIND(HasPackedSmiElements, PACKED_SMI_ELEMENTS)
+RUNTIME_FUNCTION_CHECK_ELEMENT_KIND(HasPackedDoubleElements,
+                                    PACKED_DOUBLE_ELEMENTS)
+RUNTIME_FUNCTION_CHECK_ELEMENT_KIND(HasPackedObjectElements, PACKED_ELEMENTS)
+RUNTIME_FUNCTION_CHECK_ELEMENT_KIND(HasHoleySmiElements, HOLEY_SMI_ELEMENTS)
+RUNTIME_FUNCTION_CHECK_ELEMENT_KIND(HasHoleyDoubleElements,
+                                    HOLEY_DOUBLE_ELEMENTS)
+RUNTIME_FUNCTION_CHECK_ELEMENT_KIND(HasHoleyObjectElements, HOLEY_ELEMENTS)
+
+#undef RUNTIME_FUNCTION_CHECK_ELEMENT_KIND
 
 RUNTIME_FUNCTION(Runtime_ValueOf) {
   SealHandleScope shs(isolate);

src/runtime/runtime.h

@@ -382,6 +382,12 @@ namespace internal {
   F(GetOwnPropertyKeys, 2, 1)                                   \
   F(GetProperty, 2, 1)                                          \
   F(GetPrototype, 1, 1)                                         \
+  F(HasPackedSmiElements, 1, 1)                                 \
+  F(HasPackedDoubleElements, 1, 1)                              \
+  F(HasPackedObjectElements, 1, 1)                              \
+  F(HasHoleySmiElements, 1, 1)                                  \
+  F(HasHoleyDoubleElements, 1, 1)                               \
+  F(HasHoleyObjectElements, 1, 1)                               \
   F(HasFastPackedElements, 1, 1)                                \
   F(HasInPrototypeChain, 2, 1)                                  \
   F(HasProperty, 2, 1)                                          \