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e953ae5bbc
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 719d98dfa841c522d8d452f0685e503538415a53 that into account a GGC issue (probably https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92181) when dealing with intiailizer_list and constant expressions. Workaround this by avoiding initializer list, at the expense of a temporary plain old array. Differential Revision: https://reviews.llvm.org/D139881