Revert "[clang] Use a StringRef instead of a raw char pointer to store builtin and call information" There are still remaining issues with GCC 12, see for instance https://lab.llvm.org/buildbot/#/builders/93/builds/12669 This reverts commit 5ce4e92264102de21760c94db9166afe8f71fcf6. GitOrigin-RevId: 07d9ab9aa5d272cad99617a1f28cdcfd73d86550