This patch adds support for prog_name and map_name.

For libbpf.{h,c}, the new functions, bpf_prog_load_name()
and bpf_create_map_name() is created to avoid breaking the
existing libbpf.{a,so} user.

libbcc.py is also modified accordingly to reflect the
availability of the new functions in libbpf.

clang/b_frontend_action.cc, b/codegen_llvm.cc and BPF.cc are
modified to take advantage of the prog and map name also.

Run the following tests in new and old kernel (old kernel
in the sense that it does not support the prog/map name):

1) tools/trace.py -K sys_clone
2) examples/cpp/HelloWorld

Here is the output of the bpf (BPF Snapshot) that
will be introduced in the later patch:
[root@arch-fb-vm1 bcc]# ./tools/biosnoop.py

[root@arch-fb-vm1 bcc]# ./build/introspection/bps
      BID TYPE                 UID  #MAPS LoadTime     NAME
      113 kprobe                 0      1 Oct20/13:11  trace_pid_start
      114 kprobe                 0      1 Oct20/13:11  trace_req_start
      115 kprobe                 0      3 Oct20/13:11  trace_req_compl

[root@arch-fb-vm1 bcc]# ./build/introspection/bps 113
      BID TYPE                 UID  #MAPS LoadTime     NAME
      113 kprobe                 0      1 Oct20/13:11  trace_pid_start

     MID TYPE            FLAGS         KeySz  ValueSz  MaxEnts NAME
     186 hash            0x0               8       20    10240 infobyreq
Signed-off-by: Martin KaFai Lau <kafai@fb.com>