[wasm] Cleanup AST decoder. Remove Tree and TreeResult.

src/compiler/wasm-compiler.h

 // Copyright 2015 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_WASM_COMPILER_H_
 #define V8_COMPILER_WASM_COMPILER_H_
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
 // Do not include anything from src/compiler here!
 #include "src/compiler.h"
@@ skipping 11 matching lines @@
 class Graph;
 class Operator;
 class SourcePositionTable;
 }  // namespace compiler
 
 namespace wasm {
 // Forward declarations for some WASM data structures.
 struct ModuleEnv;
 struct WasmFunction;
 class ErrorThrower;
-struct Tree;
+struct DecodeStruct;
 
 // Expose {Node} and {Graph} opaquely as {wasm::TFNode} and {wasm::TFGraph}.
 typedef compiler::Node TFNode;
 typedef compiler::JSGraph TFGraph;
 }  // namespace wasm
 
 namespace compiler {
 class WasmCompilationUnit final {
  public:
   WasmCompilationUnit(wasm::ErrorThrower* thrower, Isolate* isolate,
@@ skipping 22 matching lines @@
   Isolate* isolate_;
   wasm::ModuleEnv* module_env_;
   const wasm::WasmFunction* function_;
   // The graph zone is deallocated at the end of ExecuteCompilation.
   base::SmartPointer<Zone> graph_zone_;
   JSGraph* jsgraph_;
   Zone compilation_zone_;
   CompilationInfo info_;
   base::SmartPointer<CompilationJob> job_;
   uint32_t index_;
-  wasm::Result<wasm::Tree*> graph_construction_result_;
+  wasm::Result<wasm::DecodeStruct*> graph_construction_result_;
   bool ok_;
 };
 
 // Wraps a JS function, producing a code object that can be called from WASM.
 Handle<Code> CompileWasmToJSWrapper(Isolate* isolate,
                                     Handle<JSFunction> function,
                                     wasm::FunctionSig* sig, uint32_t index,
                                     Handle<String> import_module,
                                     MaybeHandle<String> import_function);
 
@@ skipping 259 matching lines @@
     Node** buf = Buffer(new_count);
     if (buf != buffer) memcpy(buf, buffer, old_count * sizeof(Node*));
     return buf;
   }
 };
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_WASM_COMPILER_H_