Emit buildid profile to support DSO optimization

[aaupov]

llvm/llvm-project#186931 has added the support in pre-aggregated profile.
Teach ebpf-bolt to emit this.
perf can return buildid via mmap2 event (PERF_RECORD_MISC_MMAP_BUILD_ID) if requested via perf_event_attr. build_id on perf_event_open (https://man7.org/linux/man-pages/man2/perf_event_open.2.html)

[aaupov]

cc @paschalis-mpeis @itrofimow

[paschalis-mpeis]

Hey Amir,

I started looking at this, can you assign me this issue?