Release_38 cherry-picks

Hi all,

I'd like to merge a few more small bugfixes onto the 38 release
branch. I'll plan to do it tomorrow (3/7) in the evening if I don't
hear any objections. Thanks!

r259433 - Fix getCompiler in unit testing framework on compiler symlinks
r267459 - Add missing qRegisterInfo option to gdbremote testcase
r271899 - Don't remove PIE executables when using svr4 packets



You should get approval from the release manager (Tom Stellard) first.

All of those look simple enough. Two are for testing only and the last one is a simple fix needed for PIE exe debugging.

Greg Clayton