lib/bitmap: Faster bitmap functions.

Replace bitwise loops with a single operation, inline all bitmap
functions.  Inlining allows the compiler to remove unnecessary code
due to some parameters being compile-time constants.

Before:

$ tests/ovstest test-bitmap benchmark 1000000
bitmap equal:    341 ms
bitmap scan:   8089 ms

After:

$ tests/ovstest test-bitmap benchmark 1000000
bitmap equal:    152 ms
bitmap scan:    146 ms

Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
Co-authored-by: Kmindg <kmindg@gmail.com>
Acked-by: Ben Pfaff <blp@nicira.com>

lib/util.h

@@ -512,7 +512,7 @@ zero_rightmost_1bit(uintmax_t x)
  *
  * Unlike the other functions for rightmost 1-bits, this function only works
  * with 32-bit integers. */
-static inline uint32_t
+static inline int
 rightmost_1bit_idx(uint32_t x)
 {
     return ctz32(x);