lang: types: We should use the platform-dependent int instead

This could be a 32 or 64 bit sized int depending on arch.

lang/types/util.go

@@ -23,13 +23,14 @@ import (
 )
 
 // nextPowerOfTwo gets the lowest number higher than v that is a power of two.
-func nextPowerOfTwo(v uint32) uint32 {
+func nextPowerOfTwo(v uint) uint {
 	v--
 	v |= v >> 1
 	v |= v >> 2
 	v |= v >> 4
 	v |= v >> 8
 	v |= v >> 16
+	v |= v >> 32
 	v++
 	return v
 }