Fix warnings that were exposed when running with SK_DEBUG enable on an optimized release build.
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1917223006

Review-Url: https://codereview.chromium.org/1917223006
diff --git a/src/core/SkPath.cpp b/src/core/SkPath.cpp
index 87ecd4e..fbda7e8 100644
--- a/src/core/SkPath.cpp
+++ b/src/core/SkPath.cpp
@@ -2250,6 +2250,7 @@
     , fIsCurve(false) {
         fExpectedDir = kInvalid_DirChange;
         // warnings
+        fPriorPt.set(0,0);
         fLastPt.set(0, 0);
         fCurrPt.set(0, 0);
         fLastVec.set(0, 0);