calls.c (emit_library_call_value_1): Add USEs and CLOBBERs to function usage for arguments passed by reference.

* calls.c (emit_library_call_value_1): Add USEs and CLOBBERs
to function usage for arguments passed by reference.  Optimize
callee-copied arguments.
* regmove.c (find_related_toplev): Find uses in function usage.
(replace_in_call_usage): New function.
(fixup_match_1): Call it.
* cse.c (cse_insn): Canonicalize registers in function usage.
* reload1.c (replace_pseudos_in_call_usage): New function.
(reload): Call it.

From-SVN: r38964