[Compiler] Put background compilation of eager inner functions behind a flag.

src/compiler.cc

 // Copyright 2012 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.
 
 #include "src/compiler.h"
 
 #include <algorithm>
 #include <memory>
 
 #include "src/asmjs/asm-js.h"
@@ skipping 368 matching lines @@
 bool UseAsmWasm(DeclarationScope* scope, Handle<SharedFunctionInfo> shared_info,
                 bool is_debug) {
   return FLAG_validate_asm && scope->asm_module() &&
          !shared_info->is_asm_wasm_broken() && !is_debug;
 }
 
 bool UseCompilerDispatcher(CompilerDispatcher* dispatcher,
                            DeclarationScope* scope,
                            Handle<SharedFunctionInfo> shared_info,
                            bool is_debug, bool will_serialize) {
-  return dispatcher->IsEnabled() && !is_debug && !will_serialize &&
+  return FLAG_compiler_dispatcher_eager_inner && dispatcher->IsEnabled() &&
+         !is_debug && !will_serialize &&
          !UseAsmWasm(scope, shared_info, is_debug);
 }
 
 CompilationJob* GetUnoptimizedCompilationJob(CompilationInfo* info) {
   // Function should have been parsed and analyzed before creating a compilation
   // job.
   DCHECK_NOT_NULL(info->literal());
   DCHECK_NOT_NULL(info->scope());
 
   if (ShouldUseIgnition(info)) {
@@ skipping 1399 matching lines @@
     DCHECK(shared->is_compiled());
     function->set_literals(cached.literals);
   } else if (shared->is_compiled()) {
     // TODO(mvstanton): pass pretenure flag to EnsureLiterals.
     JSFunction::EnsureLiterals(function);
   }
 }
 
 }  // namespace internal
 }  // namespace v8