[turbofan] Inline calls to CPP builtins

src/builtins/builtins.h

Index: src/builtins/builtins.h
diff --git a/src/builtins/builtins.h b/src/builtins/builtins.h
index 68fd84ec0dd0aa7a973afaca5f4e123e3a86d41e..9ec48a678dfbadd199d4f4246adb93be09566a96 100644
--- a/src/builtins/builtins.h
+++ b/src/builtins/builtins.h
@@ -615,6 +615,16 @@ class Builtins {
       TailCallMode tail_call_mode,
       CallableType function_type = CallableType::kAny);
 
+  bool IsCppBuiltin(Name name) const {
+    DCHECK(name < BUILTIN_COUNT);
+    return (builtins_[name].kind == CPP || builtins_[name].kind == API);
+  }
+
+  const Descriptor* DescriptorFor(Name name) const {
+    DCHECK(name < BUILTIN_COUNT);
+    return &builtins_[name];
+  }
+
   Code* builtin(Name name) {
     // Code::cast cannot be used here since we access builtins
     // during the marking phase of mark sweep. See IC::Clear.