Renamed chpl-mem-desc.h constants to reflect string_strided_select being renamed string_select.


git-svn-id: svn+ssh://svn.code.sf.net/p/chapel/code/trunk@22517 3a8e244f-b0f2-452b-bcba-4c88e055c3ca
Performance testing was still broken.  Turns out computePerfStats couldn't find
the .exec.out.tmp file.  Should be able recognize it now.



git-svn-id: svn+ssh://svn.code.sf.net/p/chapel/code/trunk@22518 3a8e244f-b0f2-452b-bcba-4c88e055c3ca