trace/rt: fixup -stable backport
v5.12-rc6 got the following tracing change: 9deb193a [tracing: Fix stack trace event size] And it was very quickly (magically) backported to 5.10.28, but was not a cherry pick, since the tracing flags are different in the 5.10 series. BUT, in 5.12 more of the preempt-rt tracing changes also merged 36590c50 [tracing: Merge irqflags + preempt counter], which means that the original 5.12 commit is actually correct for 5.10-rt, not the ported -stable variant. We substitute trace_ctx for the pc,flags seen in the 5.10 port, and -rt builds again. Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
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