Moved bit operations out of shared.[hc] and created bitops.[hc]

based on https://github.com/hashcat/hashcat/pull/485/commits/1aafa13e09973568ae58e4a539ce1d7772bd7e0b

src/bitops.c

@@ -0,0 +1,51 @@
+/**
+ * Authors.....: Jens Steube <jens.steube@gmail.com>
+ * License.....: MIT
+ */
+
+#include "bitops.h"
+
+u32 is_power_of_2 (const u32 v)
+{
+  return (v && !(v & (v - 1)));
+}
+
+u32 rotl32 (const u32 a, const u32 n)
+{
+  return ((a << n) | (a >> (32 - n)));
+}
+
+u32 rotr32 (const u32 a, const u32 n)
+{
+  return ((a >> n) | (a << (32 - n)));
+}
+
+u64 rotl64 (const u64 a, const u64 n)
+{
+  return ((a << n) | (a >> (64 - n)));
+}
+
+u64 rotr64 (const u64 a, const u64 n)
+{
+  return ((a >> n) | (a << (64 - n)));
+}
+
+u32 byte_swap_32 (const u32 n)
+{
+  return (n & 0xff000000) >> 24
+       | (n & 0x00ff0000) >>  8
+       | (n & 0x0000ff00) <<  8
+       | (n & 0x000000ff) << 24;
+}
+
+u64 byte_swap_64 (const u64 n)
+{
+  return (n & 0xff00000000000000ULL) >> 56
+       | (n & 0x00ff000000000000ULL) >> 40
+       | (n & 0x0000ff0000000000ULL) >> 24
+       | (n & 0x000000ff00000000ULL) >>  8
+       | (n & 0x00000000ff000000ULL) <<  8
+       | (n & 0x0000000000ff0000ULL) << 24
+       | (n & 0x000000000000ff00ULL) << 40
+       | (n & 0x00000000000000ffULL) << 56;
+}