Use the initializer list to initialize String::m_impl, instead of doing it in the constructor's body. This should be slightly more efficient.
Pull request: https://github.com/WebKit/WebKit/pull/11379
Committed 261530@main (c0b2534060e4): <https://commits.webkit.org/261530@main> Reviewed commits have been landed. Closing PR #11379 and removing active labels.
<rdar://problem/106573875>