Speed up convexpaths GM in debug builds

That GM has a path with 16k points, arranged in a rectangle. When we try
to draw it in Ganesh, we first check to see if it's a (closed) rectangle.
We eventually decide that it is a rectangle, but not closed, so it gets
passed along. Then we construct a GrShape, which tries to simplify the
shape, again asking if it's a rectangle...

Each isRect query was iterating over the 16k verbs, and for each one,
calling atVerb(i). That, internally, calls verbs(), which calls validate()
in debug builds. So we were walking all 16k points 16k times (to ensure
the bounds were correct). The end result is that the GM took over 11
seconds to draw, and now takes 3 ms.

Bug: skia:
Change-Id: If5f7a067b8c25f049dc64275d94a42ae4a50f6a9
Reviewed-on: https://skia-review.googlesource.com/34723
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>

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