[opus] [OPUS] celt_inner_prod() and dual_inner_prod() NEON intrinsics

[Linfeng Zhang]

Hi,

Attached are 5 patches related to celt_inner_prod() and dual_inner_prod()
NEON intrinsics optimization.

In 0004-Optimize-floating-point-celt_inner_prod-and-dual_inn.patch, the
optimization changed the order of floating-point inner products, which will
change the results. I created celt_inner_prod_neon_float_c_simulation()
and dual_inner_prod_neon_float_c_simulation() to simulate the order
floating-point operations in NEON optimization and compare their results.
Sorry that I cannot bond the distance between original C function and NEON
function to any giving reasonable small number or ratio. It's easy to
create an input which 0 and 1,000 are both correct results by just
manipulating the inner product order.

The total speed gain is about 1.0% for fixed-point encoder, and 1.8% for
floating-point encoder, in Complexity 8, tested on my Chromebook.

Thanks,
Linfeng
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