commit 9e42885d045eb09d316363bc5d74e9ad9cd9382f
author Bill Nell <bnell@fb.com> Mon Oct 16 20:09:43 2017
committer Maksim Panchenko <maks@fb.com> Mon Oct 16 20:09:43 2017
tree e8b2b292c07a942c19511f76765b499477fad4a1
parent 1288c81c9b5eaa5a3e87c67908f2904e56fea919

[BOLT] Add value profiling to BOLT

Summary:
Add support for reading value profiling info from perf data.  This diff adds support in DataReader/DataAggregator for value profiling data.  Each event is recorded as two Locations (a PC and an address/value) and a count.

For now, I'm assuming that the value profiling data is in the same file as the usual BOLT profiling data.  Collecting both at the same time seems to work.

(cherry picked from FBD6076877)