perf annotate: Introduce alternative method of keeping instructions table

Some arches may want to dynamically populate the table using regular
expressions on the instruction names to associate them with a set of
parsing/formatting/etc functions (struct ins_ops), so provide a fallback
for when the ins__find() method fails.

That fall back will be able to resize the arch->instructions, setting
arch->nr_instructions appropriately, helper functions to associate an
ins_ops to an instruction name, growing the arch->instructions if needed
and resorting it are provided, all the arch specific callback needs to
do is to decide if the missing instruction should be added to
arch->instructions with a ins_ops association.

Reviewed-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Chris Riyder <chris.ryder@arm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kim Phillips <kim.phillips@arm.com>
Cc: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Taeung Song <treeze.taeung@gmail.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-auu13yradxf7g5dgtpnzt97a@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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