[vm] Cleanup unused Library::GetFunctionClosure

TEST=ci

Change-Id: I303ea1fc07c9a682f8c3b2800c9baebd78fc567f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/428302
Reviewed-by: Ryan Macnak <[email protected]>
Commit-Queue: Alexander Markov <[email protected]>

Author: alexmarkov

runtime/vm/object.cc

@@ -16019,31 +16019,6 @@ FunctionPtr Library::GetFunction(const Library& lib,
   return func.ptr();
 }
 
-ObjectPtr Library::GetFunctionClosure(const String& name) const {
-  Thread* thread = Thread::Current();
-  Zone* zone = thread->zone();
-  Function& func = Function::Handle(zone, LookupFunctionAllowPrivate(name));
-  if (func.IsNull()) {
-    // Check whether the function is reexported into the library.
-    const Object& obj = Object::Handle(zone, LookupReExport(name));
-    if (obj.IsFunction()) {
-      func ^= obj.ptr();
-    } else {
-      // Check if there is a getter of 'name', in which case invoke it
-      // and return the result.
-      const String& getter_name = String::Handle(zone, Field::GetterName(name));
-      func = LookupFunctionAllowPrivate(getter_name);
-      if (func.IsNull()) {
-        return Closure::null();
-      }
-      // Invoke the getter and return the result.
-      return DartEntry::InvokeFunction(func, Object::empty_array());
-    }
-  }
-  func = func.ImplicitClosureFunction();
-  return func.ImplicitStaticClosure();
-}
-
 #if defined(DEBUG) && !defined(DART_PRECOMPILED_RUNTIME)
 void Library::CheckFunctionFingerprints() {
   Library& lib = Library::Handle();

runtime/vm/object.h

@@ -5443,11 +5443,6 @@ class Library : public Object {
   void CheckReload(const Library& replacement,
                    ProgramReloadContext* context) const;
 
-  // Returns a closure of top level function 'name' in the exported namespace
-  // of this library. If a top level function 'name' does not exist we look
-  // for a top level getter 'name' that returns a closure.
-  ObjectPtr GetFunctionClosure(const String& name) const;
-
   // Ensures that all top-level functions and variables (fields) are loaded.
   void EnsureTopLevelClassIsFinalized() const;