[turbofan] Enable concurrent (re)compilation.

test/cctest/wasm/wasm-run-utils.h

 // Copyright 2016 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 WASM_RUN_UTILS_H
 #define WASM_RUN_UTILS_H
 
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
@@ skipping 467 matching lines @@
   }
 
   Handle<Code> Compile() {
     InitializeDescriptor();
     CallDescriptor* desc = descriptor_;
     if (kPointerSize == 4) {
       desc = testing_module_->GetI32WasmCallDescriptor(this->zone(), desc);
     }
     CompilationInfo info(debug_name_, this->isolate(), this->zone(),
                          Code::ComputeFlags(Code::WASM_FUNCTION));
-    compiler::ZonePool zone_pool(this->isolate()->allocator());
-    compiler::ZonePool::Scope pipeline_zone_scope(&zone_pool);
-    Pipeline pipeline(&info);
-    pipeline.InitializeWasmCompilation(this->zone(), &zone_pool, this->graph(),
-                                       &source_position_table_);
-    Handle<Code> code;
-    if (pipeline.ExecuteWasmCompilation(desc)) {
-      code = pipeline.FinalizeWasmCompilation(desc);
-    } else {
-      code = Handle<Code>::null();
+    v8::base::SmartPointer<OptimizedCompileJob> job(
+        Pipeline::NewWasmCompilationJob(&info, graph(), desc,
+                                        &source_position_table_));
+    Handle<Code> code = Handle<Code>::null();
+    if (job->OptimizeGraph() == OptimizedCompileJob::SUCCEEDED &&
+        job->GenerateCode() == OptimizedCompileJob::SUCCEEDED) {
+      code = info.code();
     }
-    pipeline_zone_scope.Destroy();
 #ifdef ENABLE_DISASSEMBLER
     if (!code.is_null() && FLAG_print_opt_code) {
       OFStream os(stdout);
       code->Disassemble("wasm code", os);
     }
 #endif
 
     return code;
   }
 
@@ skipping 137 matching lines @@
     if (p1 == MachineType::None()) return 1;
     if (p2 == MachineType::None()) return 2;
     if (p3 == MachineType::None()) return 3;
     return 4;
   }
 };
 
 }  // namespace
 
 #endif