Add -stack-info-frame command (MI)

Summary:
Add -stack-info-frame command + test.

All tests pass on OS X.

Reviewers: emaste, clayborg, abidh

Reviewed By: abidh

Subscribers: lldb-commits, clayborg, emaste, abidh

Differential Revision: http://reviews.llvm.org/D7750

llvm-svn: 229857