tracing: use union for multi-usages field
Impact: cleanup struct dyn_ftrace::ip has different usages in his lifecycle, we use union for it. And also for struct dyn_ftrace::flags. Signed-off-by: NLai Jiangshan <laijs@cn.fujitsu.com> Cc: Steven Rostedt <srostedt@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <49C871BE.3080405@cn.fujitsu.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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