use left-shift macro to fix/avoid undefined behvarior warnings

src/core/SkScan_AntiPath.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkScanPriv.h"
@@ skipping 685 matching lines @@
     // now use the (possibly wrapped) blitter
     blitter = clipper.getBlitter();
 
     if (isInverse) {
         sk_blit_above(blitter, ir, *clipRgn);
     }
 
     SkIRect superRect, *superClipRect = nullptr;
 
     if (clipRect) {
-        superRect.set(  clipRect->fLeft << SHIFT, clipRect->fTop << SHIFT,
-                        clipRect->fRight << SHIFT, clipRect->fBottom << SHIFT);
+        superRect.set(SkLeftShift(clipRect->fLeft, SHIFT),
+                      SkLeftShift(clipRect->fTop, SHIFT),
+                      SkLeftShift(clipRect->fRight, SHIFT),
+                      SkLeftShift(clipRect->fBottom, SHIFT));
         superClipRect = &superRect;
     }
 
     SkASSERT(SkIntToScalar(ir.fTop) <= path.getBounds().fTop);
 
     // MaskSuperBlitter can't handle drawing outside of ir, so we can't use it
     // if we're an inverse filltype
     if (!isInverse && MaskSuperBlitter::CanHandleRect(ir) && !forceRLE) {
         MaskSuperBlitter    superBlit(blitter, ir, *clipRgn, isInverse);
         SkASSERT(SkIntToScalar(ir.fTop) <= path.getBounds().fTop);
@@ skipping 40 matching lines @@
         AntiFillPath(path, clip.bwRgn(), blitter);
     } else {
         SkRegion        tmp;
         SkAAClipBlitter aaBlitter;
 
         tmp.setRect(clip.getBounds());
         aaBlitter.init(blitter, &clip.aaRgn());
         SkScan::AntiFillPath(path, tmp, &aaBlitter, true);
     }
 }