perf tools: annotate asm_pure_loop.S

[ Upstream commit 9a352a90 ]

Annotate so it is built with non-executable stack.

Fixes: 8b975197 ("perf test: Add asm pureloop test tool")
Signed-off-by: Marcus Meissner <meissner@suse.de>
Reviewed-by: Leo Yan <leo.yan@arm.com>
Link: https://lore.kernel.org/r/20250323085410.23751-1-meissner@suse.de


Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>