perf to callgrind converter

Features:

Note that callgraphs are not supported yet. The converter can be invoked as follows: perf convert -i perf.data -o output_filename.

Name		Name	Last commit message	Last commit date
Latest commit History 10 Commits
Documentation		Documentation
arch		arch
bench		bench
config		config
lib		lib
python		python
scripts		scripts
ui		ui
util		util
CREDITS		CREDITS
MANIFEST		MANIFEST
Makefile		Makefile
README.md		README.md
bash_completion		bash_completion
builtin-annotate.c		builtin-annotate.c
builtin-bench.c		builtin-bench.c
builtin-buildid-cache.c		builtin-buildid-cache.c
builtin-buildid-list.c		builtin-buildid-list.c
builtin-convert.c		builtin-convert.c
builtin-diff.c		builtin-diff.c
builtin-evlist.c		builtin-evlist.c
builtin-help.c		builtin-help.c
builtin-inject.c		builtin-inject.c
builtin-kmem.c		builtin-kmem.c
builtin-kvm.c		builtin-kvm.c
builtin-list.c		builtin-list.c
builtin-lock.c		builtin-lock.c
builtin-probe.c		builtin-probe.c
builtin-record.c		builtin-record.c
builtin-report.c		builtin-report.c
builtin-sched.c		builtin-sched.c
builtin-script.c		builtin-script.c
builtin-stat.c		builtin-stat.c
builtin-test.c		builtin-test.c
builtin-timechart.c		builtin-timechart.c
builtin-top.c		builtin-top.c
builtin-trace.c		builtin-trace.c
builtin.h		builtin.h
command-list.txt		command-list.txt
design.txt		design.txt
perf-archive.sh		perf-archive.sh
perf.c		perf.c
perf.h		perf.h

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