[wasm][asm.js] Asm.js -> wasm custom parser.

src/wasm/wasm-module.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 <memory>
 
 #include "src/assembler-inl.h"
 #include "src/base/adapters.h"
 #include "src/base/atomic-utils.h"
 #include "src/code-stubs.h"
@@ skipping 1810 matching lines @@
           break;
         }
         case kExternalGlobal: {
           // Global imports are converted to numbers and written into the
           // {globals_} array buffer.
           if (module_->globals[import.index].type == kWasmI64) {
             ReportLinkError("global import cannot have type i64", index,
                             module_name, import_name);
             return -1;
           }
+          if (FLAG_fast_validate_asm) {
+            if (module_->globals[import.index].type == kWasmI32) {
+              value = Object::ToInt32(isolate_, value).ToHandleChecked();
+            } else {
+              value = Object::ToNumber(value).ToHandleChecked();
+            }
+          }
           if (!value->IsNumber()) {
             ReportLinkError("global import must be a number", index,
                             module_name, import_name);
             return -1;
           }
           WriteGlobalValue(module_->globals[import.index], value);
           break;
         }
         default:
           UNREACHABLE();
@@ skipping 1361 matching lines @@
                                      callee_compiled->instruction_start());
     }
     DCHECK_EQ(non_compiled_functions.size(), idx);
   }
 
   Code* ret =
       Code::cast(compiled_module->code_table()->get(func_to_return_idx));
   DCHECK_EQ(Code::WASM_FUNCTION, ret->kind());
   return handle(ret, isolate);
 }