[compiler][objects] Fix -Wshadow warnings

Bug: v8:12244,v8:12245
Change-Id: Ia999105ffd616c07d4e062e0ddf3a35419d645e6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3264644Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77774}

src/compiler/heap-refs.cc

@@ -1469,7 +1469,7 @@ ObjectData* JSHeapBroker::TryGetOrCreateData(Handle<Object> object,
 
 #define CREATE_DATA(Name)                                             \
   if (object->Is##Name()) {                                           \
-    RefsMap::Entry* entry = refs_->LookupOrInsert(object.address());  \
+    entry = refs_->LookupOrInsert(object.address());                  \
     object_data = zone()->New<ref_traits<Name>::data_type>(           \
         this, &entry->value, Handle<Name>::cast(object),              \
         ObjectDataKindFor(ref_traits<Name>::ref_serialization_kind)); \

src/objects/lookup-inl.h

@@ -101,11 +101,11 @@ LookupIterator::LookupIterator(Isolate* isolate, Handle<Object> receiver,
     // is not a typed array, then this means "array index", otherwise we need to
     // ensure the full generality so that typed arrays are handled correctly.
     if (!check_prototype_chain() && !lookup_start_object->IsJSTypedArray()) {
-      uint32_t index;
-      DCHECK(!name_->AsArrayIndex(&index));
+      uint32_t array_index;
+      DCHECK(!name_->AsArrayIndex(&array_index));
     } else {
-      size_t index;
-      DCHECK(!name_->AsIntegerIndex(&index));
+      size_t integer_index;
+      DCHECK(!name_->AsIntegerIndex(&integer_index));
     }
 #endif  // DEBUG
     Start<false>();

test/cctest/test-heap-profiler.cc

@@ -4198,7 +4198,7 @@ TEST(HeapSnapshotDeleteDuringTakeSnapshot) {
     WeakData* data =
         new WeakData{heap_profiler->TakeHeapSnapshot(), &gc_calls, &handle};
 
-    v8::HandleScope scope(env->GetIsolate());
+    v8::HandleScope inner_scope(env->GetIsolate());
     handle.Reset(env->GetIsolate(), v8::Object::New(env->GetIsolate()));
     handle.SetWeak(
         data,