Patch: fix ObjC regression (sort of)

[Dale Johannesen]

The ObjC representation of calls to objc_msgSend was
changed to use OBJ_TYPE_REF rather than NOP_EXPR.  Nobody
taught get_callee_fndecl about this change, which means that such
calls are treated as calls through a pointer.  This is wrong and a 
regression.
However, I don't know of any user-visible effect this has, so I can't
provide a testcase, and you may consider this isn't suitable for stage 
3.
(I know about it because it broke a local Apple patch.)   Built on
darwin and ObjC testsuite run (change is local to ObjC bits).

2004-12-21  Dale Johannesen  <dalej@apple.com>

         * objc/objc-act.c (objc_get_callee_fndecl):  New.
         * objc/objc-act.h:  Declare it.
         * objc/objc-lang.c (LANG_HOOKS_GET_CALLEE_FNDECL):  Use it.

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