Generalize builtins inlining flag to allow forced inlining of any function

src/compiler/js-inlining.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_JS_INLINING_H_
 #define V8_COMPILER_JS_INLINING_H_
 
 #include "src/compiler/js-graph.h"
 #include "src/compiler/graph-reducer.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class JSCallFunctionAccessor;
 struct Inlinee;
 
 class JSInliner final : public AdvancedReducer {
  public:
-  enum Mode { kBuiltinsInlining, kGeneralInlining };
+  enum Mode { kRestrictedInlining, kGeneralInlining };
 
   JSInliner(Editor* editor, Mode mode, Zone* local_zone, CompilationInfo* info,
             JSGraph* jsgraph)
       : AdvancedReducer(editor),
         mode_(mode),
         local_zone_(local_zone),
         info_(info),
         jsgraph_(jsgraph) {}
 
   Reduction Reduce(Node* node) final;
 
  private:
   Mode const mode_;
   Zone* local_zone_;
   CompilationInfo* info_;
   JSGraph* jsgraph_;
 
   Node* CreateArgumentsAdaptorFrameState(JSCallFunctionAccessor* call,
                                          Zone* temp_zone);
 
   Reduction InlineCall(Node* call, Inlinee& inlinee);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_INLINING_H_