[wasm] Rename ast-decoder.* to function-body-decoder.*

src/wasm/wasm-objects.cc

 // 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.
 
 #include "src/wasm/wasm-objects.h"
 #include "src/utils.h"
 
 #include "src/debug/debug-interface.h"
 #include "src/wasm/module-decoder.h"
 #include "src/wasm/wasm-module.h"
@@ skipping 777 matching lines @@
 
   AccountingAllocator alloc;
   Zone tmp(&alloc, ZONE_NAME);
   const byte* module_start = module_bytes()->GetChars();
 
   for (uint32_t func_idx = start_func_index; func_idx <= end_func_index;
        ++func_idx) {
     WasmFunction& func = functions[func_idx];
     if (func.code_start_offset == func.code_end_offset) continue;
 
-    AstLocalDecls locals(&tmp);
+    BodyLocalDecls locals(&tmp);
     BytecodeIterator iterator(module_start + func.code_start_offset,
                               module_start + func.code_end_offset, &locals);
     DCHECK_LT(0u, locals.decls_encoded_size);
     for (uint32_t offset : iterator.offsets()) {
       uint32_t total_offset = func.code_start_offset + offset;
       if (total_offset >= end_offset) {
         DCHECK_EQ(end_func_index, func_idx);
         break;
       }
       if (total_offset < start_offset) continue;
@@ skipping 26 matching lines @@
       !array->get(kPreviousInstanceWrapper)->IsFixedArray())
     return false;
   return true;
 }
 
 void WasmInstanceWrapper::set_instance_object(Handle<JSObject> instance,
                                               Isolate* isolate) {
   Handle<WeakCell> cell = isolate->factory()->NewWeakCell(instance);
   set(kWrapperInstanceObject, *cell);
 }