[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 fa82314f3b0e9c757b3af72e9231a6159f04d7e7..7787eb4614cda0dfc9992e1c7b76d6874e4443b3 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, false);
     SimpleInstallFunction(prototype, "split", Builtins::kStringPrototypeSplit,
                           2, true);
     SimpleInstallFunction(prototype, "substr", Builtins::kStringPrototypeSubstr,