be more careful about OOB source pixels in the scanline rescaler, and

src/core/SkBitmapProcState.cpp

Index: src/core/SkBitmapProcState.cpp
diff --git a/src/core/SkBitmapProcState.cpp b/src/core/SkBitmapProcState.cpp
index c93a2b5cd7799fc12d6627fdf7c259e711a9cc76..39f6a7803920fcbc2d0f9d3c1741aa762086dc09 100644
--- a/src/core/SkBitmapProcState.cpp
+++ b/src/core/SkBitmapProcState.cpp
@@ -409,8 +409,6 @@ bool SkBitmapProcState::chooseProcs(const SkMatrix& inv, const SkPaint& paint) {
         // platform-specific one might succeed, so it might be premature here
         // to fall back to bilerp.  This needs thought.
 
-        SkASSERT(fInvType > SkMatrix::kTranslate_Mask);
-
         if (!this->setBitmapFilterProcs()) {
             fFilterLevel = SkPaint::kLow_FilterLevel;
         }