Revert of De-templatize Sk4pxXfermode code a bit.

Revert of De-templatize Sk4pxXfermode code a bit. (patchset #2 id:20001 of https://codereview.chromium.org/1242743004/)

Reason for revert:
http://build.chromium.org/p/client.skia.compile/builders/Build-Ubuntu-GCC-Arm7-Debug-Android_NoNeon/builds/1168/steps/build%20most/logs/stdio

Original issue's description:
> De-templatize Sk4pxXfermode code a bit.
> 
> This deduplicates a few pieces of code:
>   - we end up with one copy of each xfer32() driver loop instead of one per xfermode;
>   - we end up with two* copies of each xfermode implementation instead of ten**.
> 
> * For a given Mode: Mode() itself and xfer_aa<Mode>().
> ** From unrolling: twice at a stride of 8, once at 4, once at 2, and once at 1, then all again for when we have AA.
> 
> This decreases the size of SkXfermode.o from 1.5M to 620K on x86-64 and from 1.3M to 680K on ARMv7+NEON.
> 
> If we wanted to, we could eliminate the xfer_aa<Mode>() copy by tagging each Mode() function as __attribute__((noinline)) or its equivalent.  This would result in another ~100K space savings.
> 
> Performance is affected in proportion to the original xfermode speed:
> fast modes like Plus take the largest proportional hit, and slow modes
> like HardLight or SoftLight see essentially no hit at all.
> 
> This adds SK_VECTORCALL to help keep this code fast on ARMv7 and Windows.  I've looked at the ARMv7 generated code... it looks good, even pretty.
> 
> For compatibility with SK_VECTORCALL, we now pass the vector-sized arguments by value instead of by reference.  Some refactoring now allows us to declare each mode as just a static function instead of a struct, which simplifies things.
> 
> TBR=reed@google.com
> No public API changes.
> 
> BUG=skia:
> 
> Committed: https://skia.googlesource.com/skia/+/e617e1525916d7ee684142728c0905828caf49da

TBR=msarett@google.com,mtklein@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/654ad19fbd5a295c4bd3072dc8a7b88f212bbd49

[mtklein, 2015-07-21 19:07:41]

Created Revert of De-templatize Sk4pxXfermode code a bit.

[commit-bot: I haz the power, 2015-07-21 19:07:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1245273005/1

[commit-bot: I haz the power, 2015-07-21 19:08:43]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/654ad19fbd5a295c4bd3072dc8a7b88f212bbd49