[flac-dev] A patch for precompute_partition_info_sums_()

[lvqcl]

Here I attach a preliminary version of a patch for precompute_partition_info_sums_()
function that should accelerate encoding of 24-bit input data.

1) SSE2, SSSE3 and AVX2 versions of this function should be updated, too

2) the patch also changes
     if(FLAC__bitmath_ilog2(default_partition_samples) + bps + FLAC__MAX_EXTRA_RESIDUAL_BPS < 32)
into (in effect)
     if(FLAC__bitmath_ilog2(default_partition_samples) + bps + FLAC__MAX_EXTRA_RESIDUAL_BPS <= 32)

So, should the value of FLAC__MAX_EXTRA_RESIDUAL_BPS be increased (to 5? or to 6?)

3) any comments?
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