[builtins] String.prototype.slice as a CSA builtin.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index a1d720797cb7b4fe34a4edbdfd3b5db21b7565f5..9be4fb53b6b3d92b8119e89a56d7beefc483bcd2 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1810,6 +1810,8 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
 #endif  // V8_INTL_SUPPORT
     SimpleInstallFunction(prototype, "replace",
                           Builtins::kStringPrototypeReplace, 2, true);
+    SimpleInstallFunction(prototype, "slice", Builtins::kStringPrototypeSlice,
+                          2, true);

[jgruber, 2017/05/11 08:57:40]

We could also omit argument adaption for this one (see e.g.
http://crrev.com/2865313002). (Other string builtins should also be updated at
some point).

[mvstanton, 2017/05/12 11:00:42]

Great idea - I've made the necessary adaptations..

     SimpleInstallFunction(prototype, "split", Builtins::kStringPrototypeSplit,
                           2, true);
     SimpleInstallFunction(prototype, "substr", Builtins::kStringPrototypeSubstr,