Added helper function to search for first bit set in integer.

src/mx/util/bits.h

@@ -0,0 +1,14 @@
+#pragma once
+#include <cstdint>
+
+namespace mx::util {
+inline long int bit_scan_forward(std::uint64_t val)
+{
+    if (!val)
+        return -1;
+
+    asm volatile("bsf %1, %0" : "=r"(val) : "rm"(val));
+
+    return val;
+}
+}