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/shaders/SkBitmapProcShader.cpp b/src/shaders/SkBitmapProcShader.cpp
index d157a73..d630c45 100644
--- a/src/shaders/SkBitmapProcShader.cpp
+++ b/src/shaders/SkBitmapProcShader.cpp
@@ -69,7 +69,7 @@
         SkASSERT(state.fPixmap.addr());
 
         for (;;) {
-            int n = SkTMin(count, max);
+            int n = std::min(count, max);
             SkASSERT(n > 0 && n < BUF_MAX*2);
             mproc(state, buffer, n, x, y);
             sproc(state, buffer, n, dstC);