perf trace: Add a prefix member to the strarray class
So that the user, in an upcoming patch, can select printing it to get the full string as used in the source code, not one with a common prefix chopped off so as to make the output more compact. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-zypczc88gzbmeqx7b372s138@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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