[wasm] Move WasmCompilationUnit to .h file.

src/wasm/wasm-module.cc

Index: src/wasm/wasm-module.cc
diff --git a/src/wasm/wasm-module.cc b/src/wasm/wasm-module.cc
index f297d749fec39e5fa3e9c8b325272b3ef635e552..0c10a52c932d5c2ef6f8fa410c0ef2a6ef961c2a 100644
--- a/src/wasm/wasm-module.cc
+++ b/src/wasm/wasm-module.cc
@@ -411,7 +411,7 @@ bool FetchAndExecuteCompilationUnit(
 
   compiler::WasmCompilationUnit* unit = compilation_units->at(index);
   if (unit != nullptr) {
-    compiler::ExecuteCompilation(unit);
+    unit->ExecuteCompilation();
     {
       base::LockGuard<base::Mutex> guard(result_mutex);
       executed_units->push(unit);
@@ -498,7 +498,7 @@ void InitializeParallelCompilation(
   }
 
   for (uint32_t i = FLAG_skip_compiling_wasm_funcs; i < functions.size(); i++) {
-    compilation_units[i] = compiler::CreateWasmCompilationUnit(
+    compilation_units[i] = new compiler::WasmCompilationUnit(
         &thrower, isolate, &module_env, &functions[i], i);
   }
 }
@@ -553,8 +553,9 @@ void FinishCompilationUnits(
       unit = executed_units.front();
       executed_units.pop();
     }
-    int j = compiler::GetIndexOfWasmCompilationUnit(unit);
-    results[j] = compiler::FinishCompilation(unit);
+    int j = unit->index();
+    results[j] = unit->FinishCompilation();
+    delete unit;
   }
 }
 
@@ -580,8 +581,8 @@ bool FinishCompilation(Isolate* isolate, WasmModule* module,
       code = results[i];
     } else {
       // Compile the function.
-      code =
-          compiler::CompileWasmFunction(&thrower, isolate, &module_env, &func);
+      code = compiler::WasmCompilationUnit::CompileWasmFunction(
+          &thrower, isolate, &module_env, &func);
     }
     if (code.is_null()) {
       thrower.Error("Compilation of #%d:%.*s failed.", i, str.length(),
@@ -772,7 +773,7 @@ MaybeHandle<JSObject> WasmModule::Instantiate(Isolate* isolate,
     if (!FinishCompilation(isolate, this, ffi, results, instance, code_table,
                            thrower, factory, module_env, total_code_size,
                            desc)) {
-      return MaybeHandle<JSObject>();
+      instance.js_object = Handle<JSObject>::null();
     }
 
     // Patch all direct call sites.
@@ -930,8 +931,8 @@ int32_t CompileAndRunWasmModule(Isolate* isolate, WasmModule* module) {
   for (const WasmFunction& func : module->functions) {
     DCHECK_EQ(index, func.func_index);
     // Compile the function and install it in the code table.
-    Handle<Code> code =
-        compiler::CompileWasmFunction(&thrower, isolate, &module_env, &func);
+    Handle<Code> code = compiler::WasmCompilationUnit::CompileWasmFunction(
+        &thrower, isolate, &module_env, &func);
     if (!code.is_null()) {
       if (func.exported) {
         main_code = code;