[Clang] Add support for scalable vectors in __builtin_reduce_* functions (#87750) Currently, a lot of `__builtin_reduce_*` function do not support scalable vectors, i.e., ARM SVE and RISCV V. This PR adds support for them. The main code change is to use a different path to extract the type from the vectors, the rest is the same and LLVM supports the reduce functions for `vscale` vectors. This PR adds scalable vector support for: - `__builtin_reduce_add` - `__builtin_reduce_mul` - `__builtin_reduce_xor` - `__builtin_reduce_or` - `__builtin_reduce_and` - `__builtin_reduce_min` - `__builtin_reduce_max` Note: For all except `min/max`, the element type must still be an integer value. Adding floating point support for `add` and `mul` is still an open TODO.
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