dst += stride behaving better with gcc/clang
Expanding inline function dc_SIZExSIZE() save intructions for
vpx_dc_predictor_SIZExSIZE_neon().
Change-Id: Id0ccbd58b6a31df539141fd33bdf28633339150d
The code was expanding to Q registers so that vqrshn could be used, for
vector quad round shift and narrow. If 4 values are added together,
there is a shift by 2. If 8 values, a shift by 3. Since this accounts
for any possibility of overflow, we can skip the narrowing shift.
This allows keeping the values in D registers and casting the 16 bit
value to 8 bits.
Change-Id: I8d9cfa07176271f492c116ffa6a7b351af0b8751
