Fix GCC uninitialized error

src/wasm/wasm-js.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/api-natives.h"
 #include "src/api.h"
 #include "src/asmjs/asm-js.h"
 #include "src/asmjs/asm-typer.h"
 #include "src/asmjs/asm-wasm-builder.h"
 #include "src/assert-scope.h"
@@ skipping 350 matching lines @@
   }
   const int max_table_size = 1 << 26;
   // The descriptor's 'initial'.
   int initial;
   if (!GetIntegerProperty(isolate, &thrower, context, descriptor,
                           v8_str(isolate, "initial"), &initial, 0,
                           max_table_size)) {
     return;
   }
   // The descriptor's 'maximum'.
-  int maximum;
+  int maximum = 0;
   Local<String> maximum_key = v8_str(isolate, "maximum");
   Maybe<bool> has_maximum = descriptor->Has(context, maximum_key);
 
   if (has_maximum.IsNothing()) {
     // There has been an exception, just return.
     return;
   }
   if (has_maximum.FromJust()) {
     if (!GetIntegerProperty(isolate, &thrower, context, descriptor, maximum_key,
                             &maximum, initial, max_table_size)) {
@@ skipping 31 matching lines @@
   }
   Local<Context> context = isolate->GetCurrentContext();
   Local<v8::Object> descriptor = args[0]->ToObject(context).ToLocalChecked();
   // The descriptor's 'initial'.
   int initial;
   if (!GetIntegerProperty(isolate, &thrower, context, descriptor,
                           v8_str(isolate, "initial"), &initial, 0, 65536)) {
     return;
   }
   // The descriptor's 'maximum'.
-  int maximum;
+  int maximum = 0;
   Local<String> maximum_key = v8_str(isolate, "maximum");
   Maybe<bool> has_maximum = descriptor->Has(context, maximum_key);
 
   if (has_maximum.IsNothing()) {
     // There has been an exception, just return.
     return;
   }
   if (has_maximum.FromJust()) {
     if (!GetIntegerProperty(isolate, &thrower, context, descriptor, maximum_key,
                             &maximum, initial, 65536)) {
@@ skipping 252 matching lines @@
     int unused_property_fields = in_object_properties - pre_allocated;
     Handle<Map> map = Map::CopyInitialMap(
         prev_map, instance_size, in_object_properties, unused_property_fields);
 
     context->set_wasm_function_map(*map);
   }
 }
 
 }  // namespace internal
 }  // namespace v8