simd: Implement missing reduction intrinsics

Implements the following simd reduction intrinsics:
- simd_reduce_add_ordered
- simd_reduce_mul_ordered
- simd_reduce_min_nanless
- simd_reduce_max_nanless
- simd_reduce_xor
- simd_reduce_any
- simd_reduce_all

Also fixes the ordering of simd_reduce_min and simd_reduce_max,
which were tested to be flipped.

Both simd_reduce_min_nanless and simd_reduce_max_nanless are identical
to their non-nanless variants for the time being.  An attempt was made
at a more optimal codegen solution based on vector_reduce_op.  However,
this approach ran into masking issues for floating-point vector types,
which appears to be broken for the same reason that comparison
operations such as simd_lt are broken for floating-point vector types.
More investigation is required, however, to determine a root cause and
appropriate fix.

This should be enough to pass the generic-reduction-pass.rs ui tests
with the 'master' feature enabled.

Signed-off-by: Andy Sadler <andrewsadler122@gmail.com>

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