[tools/perf] perf test LLVM failure on 4.9

[valdis.kletnieks at vt.edu]

On Tue, 23 Jan 2018 18:07:25 +0530, Pintu Kumar said:

> My uname says:
> 4.9-xxxx-amd-x86-64

Literally 4.9-xxxx?  No 3rd number? And why 'xxxx'? (Hint - obfuscating doesn't
help here, it's hard to debug when we don't see the *actual* string.)

Some unames from my various machines:

4.15.0-rc7-next-20180112-dirty (x86_64 laptop)
4.9.35-v7+  (raspberry pi)
4.9.73   (Lede-based router)
3.10.0-229.20.1.el7.x86_64 (RHEL 7.3)
3.0.101-68-default (SLES 11.4)

I'm pretty sure the fact that your uname is only returning 2 numbers
before the '-' is the root cause of your problem.
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