[binutils-gdb] btrace: Add btinfo to instruction interator.

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 521103fd00e593c08a6bedb619c5a9f8f7cc5a91 ***

Author: Tim Wiederhake <tim.wiederhake@intel.com>
Branch: master
Commit: 521103fd00e593c08a6bedb619c5a9f8f7cc5a91

btrace: Add btinfo to instruction interator.

This will serve as the access path to the vector of function segments once
the FUNCTION pointer in struct btrace_insn_iterator is removed.