PPCSymbolDB: GetDescription by std::string_view

Should save a lot of deep copies.

Source/Core/DolphinQt/QtUtils/FromStdString.h

@@ -0,0 +1,23 @@
+// Copyright 2024 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <QString>
+#include <string_view>
+
+namespace QtUtils
+{
+inline QString FromStdString(std::string_view s)
+{
+  return QString::fromUtf8(s.data(), s.size());
+}
+inline QString FromStdString(std::u8string_view s)
+{
+  return QString::fromUtf8(s.data(), s.size());
+}
+inline QString FromStdString(std::u16string_view s)
+{
+  return QString::fromUtf16(s.data(), s.size());
+}
+}  // namespace QtUtils