[objects] Remove unnecessary loop in LookupKey

Change-Id: Iee3a65c6df143a41b45b610a10a19ec28ad5c268
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2565513Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71518}

src/objects/string-table.cc

@@ -464,8 +464,6 @@ Handle<String> StringTable::LookupKey(LocalIsolate* isolate,
   // allocation if another write also did an allocation. This assumes that
   // writes are rarer than reads.
 
-  Handle<String> new_string;
-  while (true) {
   // Load the current string table data, in case another thread updates the
   // data while we're reading.
   const Data* data = data_.load(std::memory_order_acquire);
@@ -486,7 +484,7 @@ Handle<String> StringTable::LookupKey(LocalIsolate* isolate,
   // allocated value on insertion retries. If another thread concurrently
   // allocates the same string, the insert will fail, the lookup above will
   // succeed, and this string will be discarded.
-    if (new_string.is_null()) new_string = key->AsHandle(isolate);
+  Handle<String> new_string = key->AsHandle(isolate);
 
   {
     base::MutexGuard table_write_guard(&write_mutex_);
@@ -495,8 +493,7 @@ Handle<String> StringTable::LookupKey(LocalIsolate* isolate,
 
     // Check one last time if the key is present in the table, in case it was
     // added after the check.
-      InternalIndex entry =
-          data->FindEntryOrInsertionEntry(isolate, key, key->hash());
+    entry = data->FindEntryOrInsertionEntry(isolate, key, key->hash());
 
     Object element = data->Get(isolate, entry);
     if (element == empty_element()) {
@@ -516,7 +513,6 @@ Handle<String> StringTable::LookupKey(LocalIsolate* isolate,
       return handle(String::cast(element), isolate);
     }
   }
-  }
 }
 
 template Handle<String> StringTable::LookupKey(Isolate* isolate,