[Clang][LLVM] Implement single-multi vectors MOP4{A/S} (#128854)

Implement all single-multi {BF/F/S/U/SU/US}MOP4{A/S} instructions in
clang and llvm following the acle in
https://github.com/ARM-software/acle/pull/381/files.

This PR depends on https://github.com/llvm/llvm-project/pull/127797

This patch updates the semantics of template arguments in intrinsic
names for clarity and ease of use. Previously, template argument numbers
indicated which character in the prototype string determined the final
type suffix, which was confusing—especially for intrinsics using
multiple prototype modifiers per operand (e.g., intrinsics operating on
arrays of vectors). The number had to reference the correct character in
the prototype (e.g., the ‘u’ in “2.u”), making the system cumbersome and
error-prone.
With this patch, template argument numbers now refer to the operand
number that determines the final type suffix, providing a more intuitive
and consistent approach.

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