[wasm][asm.js] Don't squish error location because module end not reached.

src/asmjs/asm-wasm-builder.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"
 
 // Required to get M_E etc. in MSVC.
 #if defined(_WIN32)
 #define _USE_MATH_DEFINES
 #endif
@@ skipping 105 matching lines @@
   bool Build() {
     InitializeInitFunction();
     if (!typer_->ValidateBeforeFunctionsPhase()) {
       return false;
     }
     DCHECK(!HasStackOverflow());
     VisitFunctionLiteral(literal_);
     if (HasStackOverflow()) {
       return false;
     }
-    if (!typer_finished_) {
+    if (!typer_finished_ && !typer_failed_) {
       typer_->FailWithMessage("Module missing export section.");
       typer_failed_ = true;
     }
     if (typer_failed_) {
       return false;
     }
     BuildForeignInitFunction();
     return true;
   }
 
@@ skipping 1858 matching lines @@
   impl.builder_->WriteAsmJsOffsetTable(*asm_offsets_buffer);
   return {module_buffer, asm_offsets_buffer, success};
 }
 
 const char* AsmWasmBuilder::foreign_init_name = "__foreign_init__";
 const char* AsmWasmBuilder::single_function_name = "__single_function__";
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8