(dbxout_parms): For parameters passed in memory, delete

(dbxout_parms): For parameters passed in memory, delete
obsolete code to handle parameters converted and stored back to
the stack slot where they were passed in.
(dbxout_reg_parms): Delete obsolete ifdefed out code.  Combine
redundant PARM_PASSED_IN_MEMORY tests.  For case where parameter
lives in memory, output stab if it doesn't live where it was passed.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@9057 138bc75d-0d04-0410-961f-82ee72b054a4