Removed the unused cache line size helper method

SDWebImage/Core/SDImageCoderHelper.m

@@ -301,7 +301,6 @@ static const CGFloat kDestSeemOverlap = 2.0f;   // the numbers of pixels to over
 + (size_t)preferredByteAlignment {
     // https://github.com/path/FastImageCache#byte-alignment
     // A properly aligned bytes-per-row value must be a multiple of 8 pixels × bytes per pixel.
-    // return [SDDeviceHelper cacheLineSize]; // Seems not the CPU cache line size
     return 32;
 }
 

SDWebImage/Private/SDDeviceHelper.h

@@ -14,6 +14,5 @@
 
 + (NSUInteger)totalMemory;
 + (NSUInteger)freeMemory;
-+ (size_t)cacheLineSize;
 
 @end

SDWebImage/Private/SDDeviceHelper.m

@@ -30,18 +30,4 @@
     return vm_stat.free_count * page_size;
 }
 
-+ (size_t)cacheLineSize {
-    size_t size;
-    sysctlbyname("hw.cachelinesize", NULL, &size, NULL, 0);
-    char *info = malloc(size);
-    sysctlbyname("hw.cachelinesize", info, &size, NULL, 0);
-    if (strlen(info)) {
-        // hardcode
-        return 64;
-    }
-    char *end;
-    long result = strtol(info, &end, 10);
-    return result;
-}
-
 @end