Dummy frames broken on PowerPC

[Andrew Cagney]

>>From today's CVS I get (in break.exp):

`works for me'. gcc 2.95.3 & stabs ...

> (gdb) finish
> Run till exit from #0  0x100004c8 in marker2 (a=99) at /mnt/loc-computed/src-noindent/src/gdb/testsuite/gdb.base/break.c:49
> /mnt/loc-computed/src-noindent/src/gdb/dummy-frame.c:295: internal-error: dummy_frame_pop: Assertion `get_frame_type (fi) == DUMMY_FRAME' failed.
> A problem internal to GDB has been detected.  Further debugging may prove unreliable.
> Quit this debugging session? (y or n)

What does the backtrace look like?

I suspect frame_type_from_pc() may have some of all the logic needed to 
spot a dummy frame.  Contrast it with dummy_frame_p().  However, I've no 
basis for this - the ppc doesn't use the new frame code and the only 
other time it could affect things is with create_new_frame() - that, 
ignoring MIPS and SPARC, has only one call.

Anyway, try changing the logic to test (dummy_frame_p() != NULL) when 
DEPRECATED_USE_GENERIC_DUMMY_FRAMES.

Andrew