Remove SkTMin and SkTMax

Use std::min and std::max everywhere.

SkTPin still exists. We can't use std::clamp yet, and even when
we can, it has undefined behavior with NaN. SkTPin is written
to ensure that we return a value in the [lo, hi] range.

Change-Id: I506852a36e024ae405358d5078a872e2c77fa71e
Docs-Preview: https://skia.org/?cl=269357
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/269357
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/src/pathops/SkOpSpan.cpp b/src/pathops/SkOpSpan.cpp
index ea57756..dd854f4 100644
--- a/src/pathops/SkOpSpan.cpp
+++ b/src/pathops/SkOpSpan.cpp
@@ -178,8 +178,8 @@
         if (walk->segment() != segment) {
             continue;
         }
-        min = SkTMin(min, walk->fT);
-        max = SkTMax(max, walk->fT);
+        min = std::min(min, walk->fT);
+        max = std::max(max, walk->fT);
         if (between(min, s, max) && between(min, e, max)) {
             return Collapsed::kYes;
         }