[wasm] check that there is at most 1 table

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 209 matching lines @@
 
   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});
   }
 
-  addFunctionTableInit(base, is_global, array) {
+  addFunctionTableInit(base, is_global, array, is_import = false) {
     this.function_table_inits.push({base: base, is_global: is_global,
                                     array: array});
     if (!is_global) {
       var length = base + array.length;
-      if (length > this.function_table_length) {
+      if (length > this.function_table_length && !is_import) {
         this.function_table_length = length;
       }
     }
     return this;
   }
 
   appendToTable(array) {
     return this.addFunctionTableInit(this.function_table.length, false, array);
   }
 
@@ skipping 302 matching lines @@
     }
     return buffer;
   }
 
   instantiate(ffi) {
     let module = new WebAssembly.Module(this.toBuffer());
     let instance = new WebAssembly.Instance(module, ffi);
     return instance;
   }
 }