[llvm-exegesis] Fix compilation with old libpfm versions.
authorClement Courbet <courbet@google.com>
Thu, 8 Jul 2021 08:52:35 +0000 (10:52 +0200)
committerClement Courbet <courbet@google.com>
Mon, 12 Jul 2021 05:48:29 +0000 (07:48 +0200)
commit04f8ffd98306a0b0b60987208547ee6745b0fc3e
tree232f06c0fb2ddc18cb2c3b12a319f452f01bd398
parent57503524b18009019779d731f186cff33a34ab1a
[llvm-exegesis] Fix compilation with old libpfm versions.

Do not try include `perfmon/perf_event.h` when we are not sure that it
exists.

Fixes PR51017.

Differential Revision: https://reviews.llvm.org/D105615
llvm/tools/llvm-exegesis/lib/X86/X86Counter.cpp