Merge commit '3c504bc3599f00bfc5923adc114beef34bce11d0'

* commit '3c504bc3599f00bfc5923adc114beef34bce11d0':
  x86: deduplicate some constants

Merged-by: James Almer <jamrial@gmail.com>

libavcodec/x86/constants.h

@@ -43,6 +43,7 @@ extern const xmm_reg  ff_pw_64;
 extern const uint64_t ff_pw_96;
 extern const uint64_t ff_pw_128;
 extern const ymm_reg  ff_pw_255;
+extern const ymm_reg  ff_pw_256;
 extern const ymm_reg  ff_pw_512;
 extern const ymm_reg  ff_pw_1023;
 extern const ymm_reg  ff_pw_1024;