Added a couple more gdb-remote tests to ensure qProcessInfo on darwin is not defining triple.

And likewise for qProcessInfo on Linux, but ensures cputype/cpusubtype is not defined.  The
Apple case is the more important one, since we take a slightly different path to initialize
ProcessGDBRemote-related remote host/process info if triple is present.

Related to http://llvm.org/bugs/show_bug.cgi?id=20755.

llvm-svn: 216473