[runtime] Specialize LookupKey to StringTableKey

Change-Id: I079befeac55aae9ef9ff7743f69fdd3977adcb18
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1598760
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61292}

src/objects.cc

@@ -6860,6 +6860,7 @@ Handle<String> StringTable::LookupString(Isolate* isolate,
 }
 
 // static
+template <typename StringTableKey>
 Handle<String> StringTable::LookupKey(Isolate* isolate, StringTableKey* key) {
   Handle<StringTable> table = isolate->factory()->string_table();
   int entry = table->FindEntry(isolate, key);
@@ -6877,6 +6878,13 @@ Handle<String> StringTable::LookupKey(Isolate* isolate, StringTableKey* key) {
   return AddKeyNoResize(isolate, key);
 }
 
+template Handle<String> StringTable::LookupKey(Isolate* isolate,
+                                               OneByteStringKey* key);
+template Handle<String> StringTable::LookupKey(Isolate* isolate,
+                                               TwoByteStringKey* key);
+template Handle<String> StringTable::LookupKey(Isolate* isolate,
+                                               SeqOneByteSubStringKey* key);
+
 Handle<String> StringTable::AddKeyNoResize(Isolate* isolate,
                                            StringTableKey* key) {
   Handle<StringTable> table = isolate->factory()->string_table();

src/objects/hash-table.h

@@ -150,7 +150,7 @@ class EXPORT_TEMPLATE_DECLARE(V8_EXPORT_PRIVATE) HashTable
 
   // Find entry for key otherwise return kNotFound.
   inline int FindEntry(ReadOnlyRoots roots, Key key, int32_t hash);
-  int FindEntry(Isolate* isolate, Key key);
+  inline int FindEntry(Isolate* isolate, Key key);
 
   // Rehashes the table in-place.
   void Rehash(ReadOnlyRoots roots);

src/objects/string-table.h

@@ -65,6 +65,7 @@ class StringTable : public HashTable<StringTable, StringTableShape> {
   // added. The return value is the string found.
   V8_EXPORT_PRIVATE static Handle<String> LookupString(Isolate* isolate,
                                                        Handle<String> key);
+  template <typename StringTableKey>
   static Handle<String> LookupKey(Isolate* isolate, StringTableKey* key);
   static Handle<String> AddKeyNoResize(Isolate* isolate, StringTableKey* key);
   static String ForwardStringIfExists(Isolate* isolate, StringTableKey* key,