Revert "remove pathop template"

This reverts commit 521f1ed0b677b86be291a7b4866ff84564dc3a1b.

Reason for revert: msan ubsan errors

Original change's description:
> remove pathop template
> 
> Pathops used templates for curve intersection.
> Since only one template is required if curves share
> an abstract base, remove the template altogether.
> 
> This makes the code easier to read, and incidentally
> makes it slightly smaller and much faster.
> 
> This also removes debugging code specific to templates,
> and removes Simplify code which isn't covered by tests
> or fuzz.
> 
> This shaves the execution time of
> pathops_unittest -V -x from 6m to 3m23s.
> 
> R=​kjlubick@google.com
> 
> Bug: skia:
> Change-Id: I00c08210e47efed83295276ae89ad64e7ec07ade
> Reviewed-on: https://skia-review.googlesource.com/c/162021
> Commit-Queue: Cary Clark <caryclark@google.com>
> Reviewed-by: Kevin Lubick <kjlubick@google.com>
> Reviewed-by: Cary Clark <caryclark@google.com>

TBR=kjlubick@google.com,caryclark@google.com,caryclark@skia.org

Change-Id: Ic5828f7affb7df96ed4ca79f037cdbcfaea24384
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/c/162643
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Cary Clark <caryclark@google.com>
17 files changed