Add HAS_FEATURE to base/compiler_specific.h

Used in new base/bit_cast.h.

Change-Id: I2b2a5ffa24f5cbb7ac12d99748e14066bd280dc8
Reviewed-on: https://chromium-review.googlesource.com/340533
Reviewed-by: Robert Sesek <rsesek@chromium.org>
1 file changed