[wasm] Implement Table#set and Table#grow

test/mjsunit/wasm/wasm-module-builder.js

 // 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.
 
 // Used for encoding f32 and double constants to bits.
 let __buffer = new ArrayBuffer(8);
 let byte_view = new Int8Array(__buffer);
 let f32_view = new Float32Array(__buffer);
 let f64_view = new Float64Array(__buffer);
 
@@ skipping 65 matching lines @@
     // Copy the temporary buffer.
     this.push(...section);
   }
 }
 
 class WasmFunctionBuilder {
   constructor(module, name, type_index) {
     this.module = module;
     this.name = name;
     this.type_index = type_index;
+    this.body = [];
   }
 
   exportAs(name) {
-    this.module.exports.push({name: name, kind: kExternalFunction, index: this.index});
+    this.module.addExport(name, this.index);
     return this;
   }
 
   exportFunc() {
     this.exportAs(this.name);
     return this;
   }
 
   addBody(body) {
     this.body = body;
@@ skipping 92 matching lines @@
              mutable: false}
     this.imports.push(o);
     return this.num_imported_globals++;
   }
 
   addImportedMemory(module, name, initial = 0, maximum) {
     let o = {module: module, name: name, kind: kExternalMemory, initial: initial, maximum: maximum};
     this.imports.push(o);
   }
 
+  addExport(name, index) {
+    this.exports.push({name: name, kind: kExternalFunction, index: index});
+    return this;
+  }
+
   addDataSegment(addr, data, is_global = false) {
     this.segments.push({addr: addr, data: data, is_global: is_global});
     return this.segments.length - 1;
   }
 
   exportMemoryAs(name) {
     this.exports.push({name: name, kind: kExternalMemory, index: 0});
   }
 
   appendToTable(array) {
@@ skipping 282 matching lines @@
     }
     return buffer;
   }
 
   instantiate(...args) {
     let module = new WebAssembly.Module(this.toBuffer());
     let instance = new WebAssembly.Instance(module, ...args);
     return instance;
   }
 }