[rfa/ppc] Return the dummy frame's saved pc

[Andrew Cagney]

Hello,

The attached patch modifies rs6000_frame_saved_pc() so that when:

- a frame didn't save the PC (i.e., link register)
- the next inner most frame is a dummy

the dummy frame's link register is returned.

On a GNU/Linux PPC system (not sure which flavour but gcc is ``2.95.3'' 
:-), it fixes the following failures:

gdb.base/callfuncs.exp: backtrace after finish from nested call level 3
gdb.base/callfuncs.exp: backtrace after finish from nested call level 4
gdb.base/callfuncs.exp: backtrace at nested call level 2
gdb.base/callfuncs.exp: backtrace at nested call level 3
gdb.base/callfuncs.exp: backtrace at nested call level 4

Ok?

Andrew
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