[csa] Add CSA::CallBuiltin and Builtins::CallableFor

src/builtins/builtins.h

Index: src/builtins/builtins.h
diff --git a/src/builtins/builtins.h b/src/builtins/builtins.h
index df6ca6c0f10e1aef7b1abe6475bc0877a24894fa..e0e487fc9ab087b7262c467b70dbae00f0e4a20a 100644
--- a/src/builtins/builtins.h
+++ b/src/builtins/builtins.h
@@ -11,6 +11,7 @@
 namespace v8 {
 namespace internal {
 
+class Callable;
 template <typename T>
 class Handle;
 class Isolate;
@@ -886,6 +887,10 @@ class Isolate;
 
 #define BUILTIN_LIST_ALL(V) BUILTIN_LIST(V, V, V, V, V, V, V)
 
+#define BUILTIN_LIST_TFS(V)                                       \
+  BUILTIN_LIST(IGNORE_BUILTIN, IGNORE_BUILTIN, IGNORE_BUILTIN, V, \
+               IGNORE_BUILTIN, IGNORE_BUILTIN, IGNORE_BUILTIN)
+
 #define BUILTIN_LIST_C(V)                                            \
   BUILTIN_LIST(V, V, IGNORE_BUILTIN, IGNORE_BUILTIN, IGNORE_BUILTIN, \
                IGNORE_BUILTIN, IGNORE_BUILTIN)
@@ -959,6 +964,8 @@ class Builtins {
     return reinterpret_cast<Address>(&builtins_[name]);
   }
 
+  static Callable CallableFor(Isolate* isolate, Name name);

[Igor Sheludko, 2017/03/16 12:08:12]

Forward declarations of a base type are suitable for pointer and reference
types. I think you should include the "callable.h" into this header.

[jgruber, 2017/03/16 12:35:27]

I was surprised by this as well, but apparently incomplete types can be used as
arguments and return values in function declarations. We do the same thing with
Handle in this file. Very useful..

See
http://stackoverflow.com/questions/553682/when-can-i-use-a-forward-declaration

+
   static const char* name(int index);
 
   // Returns the C++ entry point for builtins implemented in C++, and the null