Clang gives warnings about the missing parentheses for bitwise ops.

It's not functional but just code readability.

musl-m3/include/endian.h:32:25: warning: '&' within '|' 
[-Wbitwise-op-parentheses]
         return __x>>24 | __x>>8&0xff00 | __x<<8&0xff0000 | __x<<24;
                        ~ ~~~~~~^~~~~~~


musl-m3/include/endian.h:37:23: warning: operator '<<' has lower 
precedence than '+'; '+' will be evaluated first [-Wshift-op-parentheses]
         return __bswap32(__x)+0ULL<<32 | __bswap32(__x>>32);
                ~~~~~~~~~~~~~~^~~~~~~


Thanks,
Weiming

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