ubsan shift fixes

src/core/SkMath.cpp

 /*
  * Copyright 2008 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 "SkMathPriv.h"
 #include "SkFloatBits.h"
 #include "SkFloatingPoint.h"
@@ skipping 54 matching lines @@
     int dbits = SkCLZ(denom) - 1;
     int bits = shift_bias - nbits + dbits;
 
     if (bits < 0) {  // answer will underflow
         return 0;
     }
     if (bits > 31) {  // answer will overflow
         return SkApplySign(SK_MaxS32, sign);
     }
 
-    denom <<= dbits;
-    numer <<= nbits;
+    denom *= 1 << dbits;
+    numer *= 1 << nbits;
 
     SkFixed result = 0;
 
     // do the first one
     if ((numer -= denom) >= 0) {
         result = 1;
     } else {
         numer += denom;
     }
 
@@ skipping 59 matching lines @@
         if (SkScalarNearlyZero(*cosValue)) {
             *cosValue = 0;
         }
     }
 
     if (SkScalarNearlyZero(sinValue)) {
         sinValue = 0;
     }
     return sinValue;
 }