disable platform (matrix) procs

The only platform procs left here are the matrix procs,
and calmbench + my laptop say this is roughly a no-op:

    Compared 930 benches. 0 of them seem to be significantly differrent.

My desktop is similar, just two small slowdowns, only in microbenchmarks:

    platform-procs (compared to master) is likely
        4.79% slower in draw_bitmap_aa_scale
        4.79% slower in draw_bitmap_noaa_scale
    Compared 930 benches. 2 of them seem to be significantly differrent.

This doesn't actually affect ARM builds.  There are optimized NEON
platform procs, but they're not hooked up through platformProcs(),
rather in their own idiosyncratic way.

There's like, zero chance this doesn't change at least one layout test.

Cq-Include-Trybots: luci.chromium.try:linux-blink-rel
Change-Id: Ia38e1e8eff8641599e9387f5411b2d0f6c5bfc73
Reviewed-on: https://skia-review.googlesource.com/c/171908
Auto-Submit: Mike Klein <mtklein@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
1 file changed