Revert "align skvx::Vec<N,T> to N*sizeof(T)"
Revert "align skvx::Vec<N,T> to N*sizeof(T)"

This reverts commit e3b110dc6e5f7e1c2bdeb16d4d0ca03221c5ee25.

Reason for revert: bot failures

Original change's description:
> align skvx::Vec<N,T> to N*sizeof(T)
> 
> This increases the alignment of these vector types.  I would have liked
> to keep the alignment minimal, but it's probably no big deal either way.
> 
> In terms of code generation, it doesn't make much difference for x86 or
> ARMv8, but it seems hugely important for good ARMv7 NEON code.  It's a
> ~10x difference for the bench I've been playing around with that spends
> most of its time in that SkOpts::blit_row_color32 routine.
> 
> Bug: chromium:952502
> Change-Id: Ib12caad6b9b3f3f6e821ed70bfb57099db37b15f
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/208581
> Commit-Queue: Michael Ludwig <michaelludwig@google.com>
> Reviewed-by: Michael Ludwig <michaelludwig@google.com>
> Auto-Submit: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>

TBR=14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com,michaelludwig@google.com

Change-Id: I72357b9775685efcc2cd75db220711c8145b8ac4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:952502
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/208680
Reviewed-by: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>
Commit-Queue: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>

rubenvb/skia,google/skia,rubenvb/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,rubenvb/skia,google/skia,HalCanary/skia-hc,google/skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,rubenvb/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,rubenvb/skia,google/skia,rubenvb/skia,google/skia,HalCanary/skia-hc,rubenvb/skia,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,HalCanary/skia-hc,rubenvb/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,HalCanary/skia-hc,HalCanary/skia-hc,rubenvb/skia,rubenvb/skia,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,HalCanary/skia-hc,aosp-mirror/platform_external_skia,HalCanary/skia-hc