Add missing qRegisterInfo option to gdbremote testcase

Summary:
"gcc" is equivalent to "ehframe" in ProcessGDBRemote, but
only "ehframe" was a valid response in the test suite.

Reviewers: tfiala, jasonmolenda, clayborg

Subscribers: lldb-commits, sas

Differential Revision: http://reviews.llvm.org/D18807

llvm-svn: 267459