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asm/alternative.h contains both the macros needed to use alternatives,
as well the type definitions and function prototypes for applying them.

Split the header in two, so that alternatives can be used from core
header files such as linux/compiler.h without the risk of circular
includes
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>