ubsan shift fixes

src/ports/SkFontMgr_android_parser.h

 /*
  * Copyright 2011 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.
  */
 
 #ifndef SkFontMgr_android_parser_DEFINED
 #define SkFontMgr_android_parser_DEFINED
 
@@ skipping 193 matching lines @@
         // Check for overflow
         if (n > nMax || (n == nMax && d > dMax)) {
             return false;
         }
         n = (n * 10) + d;
     }
     if (negate) {
         n = -n;
         frac = -frac;
     }
-    *value = (n << N) + frac;
+    *value = SkLeftShift(n, N) + frac;
     return true;
 }
 
 #endif /* SkFontMgr_android_parser_DEFINED */