*BREAKING changes*: func naming, types moved to br.h, etc...

- int types definitions moved to br.h
- bits_implementation() -> print_bitops_impl()
- 64 bitops use ...ll builtins instead of ...l
- add lsb and msb macros
- bit_for_each -> bit_for_each_1 (count from 1)
- bit_for_each_2 -> bit_for_each (count from 0)

src/bits.c

@@ -14,13 +14,7 @@
 #include "bits.h"
 #include "debug.h"
 
-/**
- * bits_implementation - display bitops implementation.
- *
- * For basic bitops (popcount, ctz, etc...), print the implementation
- * (builtin, emulated).
- */
-void bits_implementation(void)
+void print_bitops_impl(void)
 {
     log(0, "bitops implementation: ");