Define 2 new flags to represent:

 - when interrupts are disabled (D)
 - when interrupt disabling toggles (t)

This gives 4 combinations:
		no flag, interrupts enabled
	t	interrupts were enabled but become disabled
	D	interrupts are disabled
	Dt	interrupts were disabled but become enabled

Committer notes:

Those are control flow flags, as per 'tools/perf/Documentation/perf-intel-pt.txt:

<quote>
An interesting field that is not printed by default is 'flags' which can be
displayed as follows:

        perf script --itrace=ibxwpe -F+flags

The flags are "bcrosyiABExgh" which stand for branch, call, return, conditional,
system, asynchronous, interrupt, transaction abort, trace begin, trace end,
in transaction, VM-entry, and VM-exit respectively.
</quote>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20220124084201.2699795-12-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>