Clang: C++26 support
Added in LLVM commit b763d6a4ed4650c74c6846d743156468563b0e31.
This time the final flag form is supported from the get-go to reduce churn.
Added in LLVM commit b763d6a4ed4650c74c6846d743156468563b0e31.
This time the final flag form is supported from the get-go to reduce churn.