Optimize getbits and peekbits functions in libmix

BZ: 146000

Optimize getbits and peekbits functions in libmix.
The getbits and peekbits are divided into emulation
prevention and non-emulatioin prevention versions.

Change-Id: I206fa743cd132b3005d096ea9bb8ff57466fb333
Signed-off-by: wfeng6 <wei.feng@intel.com>
Reviewed-on: http://android.intel.com:8080/140126
Reviewed-by: Shi, PingX <pingx.shi@intel.com>
Tested-by: Shi, PingX <pingx.shi@intel.com>
Reviewed-by: cactus <cactus@intel.com>
Tested-by: cactus <cactus@intel.com>
3 files changed