[AArch64] Implement reinterpret builtins for SVE vector tuples (#69598)

This patch adds reinterpret builtins as proposed here:
https://github.com/ARM-software/acle/pull/275.

The builtins take the form:

    sv<dst>x<N>_t svreinterpret_<dst>_<src>_x<N>(sv<src>x<N>_t op)

where
- <src> and <dst> designate the source and the destination type,
respectively, all pairs chosen from {s8, u8, s16, u8, s32, u32, s64,
u64, bf16, f16, f32, f64}
  - <N> designated the number of tuple elements, 2, 3 or 4

A short (overloaded) for is also provided, where the destination type is
explicitly designated and the source type is deduced from the parameter
type. These take the form

    sv<dst>x<N>_t svreinterpret_<dst>(sv<src>x<N>_t op)

For example:

    svuin16x2_t svreinterpret_u16_s32_x2(svint32x2_t op);
    svuin16x2_t svreinterpret_u16(svint32x2_t op);