Setup PGO for dex2oat and related libraries

Bug: http://b/63768402

Setup PGO for libart-compiler.so, dexlayout.so, and the dex2oat binary.
The setup for vixl is done in an accompanying CL.  An instrumented copy
of dex2oat can be produced for the device using:
  ANDROID_PGO_INSTRUMENT=dex2oat make

Profiles for the instrumented libraries can be produced by running them
on a representative workload.

Currently, profile use is disabled (via enable_profile_use: false).
This can be turned on once a profile is checked in.

Test: Build with ANDROID_PGO_INSTRUMENT=dex2oat and verify profiles get
generated.

Change-Id: Iea056ebd4a9fe8c805ffc2211394d6e1d726264c