[wasm] Add support for multiple indirect function tables

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.
 
 class Binary extends Array {
   emit_u8(val) {
     this.push(val);
   }
 
   emit_u16(val) {
@@ skipping 209 matching lines @@
           section.emit_varint(func.type_index);
         }
       });
     }
 
     // Add table.
     if (wasm.table.length > 0) {
       if (debug) print("emitting table @ " + binary.length);
       binary.emit_section(kDeclTable, section => {
         section.emit_varint(wasm.table.length);
+        if (wasm.pad !== null) {
+          if (debug) print("emitting table padding @ " + binary.length);
+          section.emit_varint(wasm.pad);
+        }
         for (let index of wasm.table) {
           section.emit_varint(index);
         }
       });
     }
 
     // Add memory section
     if (wasm.memory != undefined) {
       if (debug) print("emitting memory @ " + binary.length);
       binary.emit_section(kDeclMemory, section => {
@@ skipping 91 matching lines @@
       binary.emit_section(kDeclNames, section => {
         section.emit_varint(wasm.functions.length);
         for (let func of wasm.functions) {
           var name = func.name == undefined ? "" : func.name;
           section.emit_string(name);
           section.emit_u8(0);  // local names count == 0
         }
       });
     }
 
-    // Add an indirect function table pad section.
-    if (wasm.pad !== null) {
-      if (debug)
-        print("emitting indirect function table pad @ " + binary.length);
-      binary.emit_section(kDeclFunctionTablePad, section => {
-        section.emit_varint(wasm.pad);
-      });
-    }
-
-    // End the module.
-    if (debug) print("emitting end @ " + binary.length);
-    binary.emit_section(kDeclEnd, section => {});
-
     return binary;
   }
 
   toBuffer(debug) {
     let bytes = this.toArray(debug);
     let buffer = new ArrayBuffer(bytes.length);
     let view = new Uint8Array(buffer);
     for (let i = 0; i < bytes.length; i++) {
       let val = bytes[i];
       if ((typeof val) == "string") val = val.charCodeAt(0);
       view[i] = val | 0;
     }
     return buffer;
   }
 
   instantiate(...args) {
     let module = new WebAssembly.Module(this.toBuffer());
     let instance = new WebAssembly.Instance(module, ...args);
     return instance;
   }
 }