compiler-intel.h: Remove duplicate definition

barrier is already defined as __memory_barrier in compiler.h
Remove this unnecessary redefinition.

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Link: http://lkml.kernel.org/r/CAJhHMCAnYPy0%2BqD-1KBnJPLt3XgAjdR12j%2BySSnPgmZcpbE7HQ@mail.gmail.com


Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>