Implement many KeyedStoreStubs using Crankshaft

src/x64/stub-cache-x64.cc

Index: src/x64/stub-cache-x64.cc
diff --git a/src/x64/stub-cache-x64.cc b/src/x64/stub-cache-x64.cc
index 8c5cb9f664638ebf713fdc72e56afa5277a1aad7..1cfe9d4d25e0455b809ba95b312e291ec4c2e3fe 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -2591,12 +2591,20 @@ Handle<Code> KeyedStoreStubCompiler::CompileStoreElement(
 
   ElementsKind elements_kind = receiver_map->elements_kind();
   bool is_js_array = receiver_map->instance_type() == JS_ARRAY_TYPE;
-  Handle<Code> stub =
-      KeyedStoreElementStub(is_js_array,
-                            elements_kind,
-                            store_mode_).GetCode(isolate());
-
-  __ DispatchMap(rdx, receiver_map, stub, DO_SMI_CHECK);
+  if (FLAG_compiled_keyed_stores &&
+      (receiver_map->has_fast_elements() ||
+       receiver_map->has_external_array_elements())) {
+    Handle<Code> stub = KeyedStoreFastElementStub(
+        is_js_array,
+        elements_kind,
+        store_mode_).GetCode(isolate());
+    __ DispatchMap(rdx, receiver_map, stub, DO_SMI_CHECK);
+  } else {
+    Handle<Code> stub =
+        KeyedStoreElementStub(is_js_array, elements_kind,
+                              store_mode_).GetCode(isolate());
+    __ DispatchMap(rdx, receiver_map, stub, DO_SMI_CHECK);
+  }
 
   TailCallBuiltin(masm(), MissBuiltin(kind()));