[CRYPTO]: small sha512 cleanup

Looks like open-coded be_to_cpu.  GCC produces rather poor code for this. 
be_to_cpu produces asm()s which are ~4 times shorter.

Compile-tested only.

I am not sure whether input can be 64bit-unaligned.
If it indeed can be, replace:

((u64*)(input))[I]  ->  get_unaligned( ((u64*)(input))+I )
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

crypto/sha512.c

@@ -104,22 +104,7 @@ const u64 sha512_K[80] = {
 
 static inline void LOAD_OP(int I, u64 *W, const u8 *input)
 {
-        u64 t1  = input[(8*I)  ] & 0xff;
-        t1 <<= 8;
-        t1 |= input[(8*I)+1] & 0xff;
-        t1 <<= 8;
-        t1 |= input[(8*I)+2] & 0xff;
-        t1 <<= 8;
-        t1 |= input[(8*I)+3] & 0xff;
-        t1 <<= 8;
-        t1 |= input[(8*I)+4] & 0xff;
-        t1 <<= 8;
-        t1 |= input[(8*I)+5] & 0xff;
-        t1 <<= 8;
-        t1 |= input[(8*I)+6] & 0xff;
-        t1 <<= 8;
-        t1 |= input[(8*I)+7] & 0xff;
-        W[I] = t1;
+	W[I] = __be64_to_cpu( ((u64*)(input))[I] );
 }
 
 static inline void BLEND_OP(int I, u64 *W)