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Merge pull request #2636 from ycqian/Abs_method_speedup

abs method change for speedup

--- a/codec/common/inc/macros.h

+++ b/codec/common/inc/macros.h

@@ -189,7 +189,11 @@

 #define WELS_SIGN(iX) ((int32_t)(iX) >> 31)

 #endif //WELS_SIGN

 #ifndef WELS_ABS

+#if 1

+#define WELS_ABS(iX) ((iX)>0 ? (iX) : -(iX))

+#else

 #define WELS_ABS(iX) ((WELS_SIGN(iX) ^ (int32_t)(iX)) - WELS_SIGN(iX))

+#endif

 #endif //WELS_ABS

 // WELS_CLIP3