ubsan shift fixes

src/core/SkScan_AntiPath.cpp

Index: src/core/SkScan_AntiPath.cpp
diff --git a/src/core/SkScan_AntiPath.cpp b/src/core/SkScan_AntiPath.cpp
index 6ea6b8b07ea37e78ef79e752a1e34d4ddbf8a1f6..1c222b9c80e93b836ecfc2c65b4e506e3d30b8a0 100644
--- a/src/core/SkScan_AntiPath.cpp
+++ b/src/core/SkScan_AntiPath.cpp
@@ -545,7 +545,7 @@ void MaskSuperBlitter::blitH(int x, int y, int width) {
     }
 #endif
 
-    x -= (fMask.fBounds.fLeft << SHIFT);
+    x -= SkLeftShift(fMask.fBounds.fLeft, SHIFT);
 
     // hack, until I figure out why my cubics (I think) go beyond the bounds
     if (x < 0) {
@@ -592,7 +592,7 @@ static bool fitsInsideLimit(const SkRect& r, SkScalar max) {
 
 static int overflows_short_shift(int value, int shift) {
     const int s = 16 + shift;
-    return (value << s >> s) - value;
+    return (SkLeftShift(value, s) >> s) - value;
 }
 
 /**