x86: Add symbolic constant for exceptions with error code

Add a symbolic constant for the bitmask which states which exceptions
carry an error code.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Link: http://lkml.kernel.org/r/1334794610-5546-3-git-send-email-hpa@zytor.com
2 files changed