Adds PGO_GEN and PGO_USE for libart and libart-compiler.

PGO_GEN=device_path is used to build an instrumented binary. The profile will be stored in the specified path in device.
PGO_USE=host_path is used to build an PGO-optimized binary. The profile should be pre-stored in the specified path in host.

Bug: 16153819
Change-Id: Ib56f8707df009f290608ca66f669db06e65815c1
1 file changed