[clang] Use a StringRef instead of a raw char pointer to store builtin and call information
This avoids recomputing string length that is already known at compile time. It has a slight impact on preprocessing / compile time, see https://llvm-compile-time-tracker.com/compare.php?from=3f36d2d579d8b0e8824d9dd99bfa79f456858f88&to=e49640c507ddc6615b5e503144301c8e41f8f434&stat=instructions:u This is a recommit of 719d98df with a change to llvm/utils/TableGen/OptParserEmitter.cpp to cope with GCC bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108158 Differential Revision: https://reviews.llvm.org/D139881
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