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

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 243 matching lines @@
     CHECK_LT(global_offset, kMaxGlobalsSize);
     return &module->globals.back();
   }
 };
 
 inline void TestBuildingGraph(Zone* zone, JSGraph* jsgraph, ModuleEnv* module,
                               FunctionSig* sig,
                               SourcePositionTable* source_position_table,
                               const byte* start, const byte* end) {
   compiler::WasmGraphBuilder builder(zone, jsgraph, sig, source_position_table);
-  TreeResult result =
+  DecodeResult result =
       BuildTFGraph(zone->allocator(), &builder, module, sig, start, end);
   if (result.failed()) {
     ptrdiff_t pc = result.error_pc - result.start;
     ptrdiff_t pt = result.error_pt - result.start;
     std::ostringstream str;
     str << "Verification failed: " << result.error_code << " pc = +" << pc;
     if (result.error_pt) str << ", pt = +" << pt;
     str << ", msg = " << result.error_msg.get();
     FATAL(str.str().c_str());
   }
@@ skipping 480 matching lines @@
 // interpreter.
 #define WASM_EXEC_TEST(name)                                               \
   void RunWasm_##name(WasmExecutionMode execution_mode);                   \
   TEST(RunWasmCompiled_##name) { RunWasm_##name(kExecuteCompiled); }       \
   TEST(RunWasmInterpreted_##name) { RunWasm_##name(kExecuteInterpreted); } \
   void RunWasm_##name(WasmExecutionMode execution_mode)
 
 }  // namespace
 
 #endif