Skia: Add NEON intrinsic D32_A8_Black
Skia: Add NEON intrinsic D32_A8_Black

If NEON support is indiciated via __ARM_HAVE_NEON flag then use
an optimized NEON intrinsics version of the D32_A8_Black masking
function.

Change-Id: I78c6dd18cdc0437907ab330ba1f19adb56b8717a
(cherry picked from commit b50f52460e78c63949b5281f7e22d674afac8683)
(cherry picked from commit a41a18bc008ef0417d5df219444d908b53fe33f7)

SuperNexus/android_external_skia,SuperNexus/android_external_skia,SuperNexus/android_external_skia,SuperNexus/android_external_skia