fix undefined signed shifts

include/private/SkFloatBits.h

 
 /*
  * 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.
  */
 
 
 #ifndef SkFloatBits_DEFINED
@@ skipping 14 matching lines @@
 }
 
 /** Convert a 2s compliment int to a sign-bit (i.e. int interpreted as float).
     This undoes the result of SkSignBitTo2sCompliment().
  */
 static inline int32_t Sk2sComplimentToSignBit(int32_t x) {
     int sign = x >> 31;
     // make x positive
     x = (x ^ sign) - sign;
     // set the sign bit as needed
-    x |= sign << 31;
+    x |= SkLeftShift(sign, 31);
     return x;
 }
 
 /** Given the bit representation of a float, return its value cast to an int.
     If the value is out of range, or NaN, return return +/- SK_MaxS32
 */
 int32_t SkFloatBits_toIntCast(int32_t floatBits);
 
 /** Given the bit representation of a float, return its floor as an int.
     If the value is out of range, or NaN, return return +/- SK_MaxS32
@@ skipping 77 matching lines @@
 static inline int32_t SkFloatToIntCeil(float x) {
     return SkFloatBits_toIntCeil(SkFloat2Bits(x));
 }
 
 //  Scalar wrappers for float-bit routines
 
 #define SkScalarAs2sCompliment(x)    SkFloatAs2sCompliment(x)
 #define Sk2sComplimentAsScalar(x)    Sk2sComplimentAsFloat(x)
 
 #endif