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ca7efca5 - [clang][builtins] Return a `SmallString` from `Builtin::Context::getQuotedName()` (#227963)

[clang][builtins] Return a `SmallString` from `Builtin::Context::getQuotedName()` (#227963) `getQuotedName()` keeps showing up in my profiling. I thought returning a `SmallString<64>` wouldn't work since we're now returning a rather large struct by value, but seems this is at least an improvement: https://llvm-compile-time-tracker.com/compare.php?from=b96b66160ace30c2b5eef1f4afdb14c95ecc26cd&to=cf9e2ae4fe5fa0bcda77a1ae6edf98a69986af39&stat=instructions:u Things like passing a stream instead don't work since we're passing this directly to the diagnostic `operator<<`.