Introduce FLAG_vector_ics.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index aaa0f3f7e521d4bf63263d48e658a8649ce7e429..0344ee1d9c9c4508bfb83cf102dd00667d264ee7 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1910,6 +1910,12 @@ bool Genesis::InstallNatives() {
     Handle<JSFunction> apply =
         InstallFunction(proto, "apply", JS_OBJECT_TYPE, JSObject::kHeaderSize,
                         MaybeHandle<JSObject>(), Builtins::kFunctionApply);
+    if (FLAG_vector_ics) {
+      // Apply embeds an IC, so we need a type vector of size 1 in the shared
+      // function info.
+      Handle<FixedArray> feedback_vector = factory()->NewTypeFeedbackVector(1);
+      apply->shared()->set_feedback_vector(*feedback_vector);
+    }
 
     // Make sure that Function.prototype.call appears to be compiled.
     // The code will never be called, but inline caching for call will