[asmjs] Validator should reject modules with repeated functions.

test/cctest/test-asm-validator.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/v8.h"
 
 #include "src/ast/ast.h"
 #include "src/ast/ast-expression-visitor.h"
 #include "src/ast/scopes.h"
 #include "src/parsing/parser.h"
@@ skipping 1343 matching lines @@
 }
 
 
 TEST(CompareMismatchInt32Float32) {
   CHECK_FUNC_ERROR(
       "function bar() { var x = 1; var y = 2.0; return (x < fround(y))|0; }\n"
       "function foo() { bar(); }",
       "asm: line 1: left and right side of comparison must match\n");
 }
 
+TEST(FunctionRepeated) {
+  CHECK_FUNC_ERROR(
+      "function foo() { return 0; }\n"
+      "function foo() { return 0; }",
+      "asm: line 2: function repeated in module\n");
+}
 
 TEST(Float64ToInt32) {
   CHECK_FUNC_TYPES_BEGIN(
       "function bar() { var x = 1; var y = 0.0; x = ~~y; }\n"
       "function foo() { bar(); }") {
     CHECK_EXPR(FunctionLiteral, FUNC_V_TYPE) {
       CHECK_EXPR(Assignment, Bounds(cache.kAsmInt)) {
         CHECK_VAR(x, Bounds(cache.kAsmInt));
         CHECK_EXPR(Literal, Bounds(cache.kAsmFixnum));
       }
@@ skipping 1126 matching lines @@
         CHECK_EXPR(BinaryOperation, Bounds(cache.kAsmDouble)) {
           CHECK_VAR(x, Bounds(cache.kAsmDouble));
           CHECK_EXPR(Literal, Bounds(cache.kAsmDouble));
         }
       }
     }
     CHECK_SKIP();
   }
   CHECK_FUNC_TYPES_END
 }