[rfa/symtab] Move find_pc_section call to lookup_minimal_symbol_by_pc

[Andrew Cagney]

> Andrew Cagney writes:
>  > Hello,
>  > 
>  > Ref: RFA symtab: Fix for PR c++/1267 ("next" and shared libraries)
>  > http://sources.redhat.com/ml/gdb-patches/2003-07/msg00354.html
>  > 
>  > The change unfortunatly broke IRIX 6.5's host compiler which is using 
>  > mdebugread :-(  That code was looking for a symbol in the absolute 
>  > section "*ABS*" but the PR/1267 change was causing *ABS* symbols to be 
>  > ignored (find_pc_section didn't return an absolute section).
>  > 
>  > Since the underlying problem with PR/1267 was with the frame code 
>  > needing a minimal symbol that was in the same section as the frame's PC, 
>  > and that code [indirectly] calls lookup_minimal_symbol_by_pc, I moved 
>  > the find_pc_section call to that function.
>  > 
>  > Tested on i386 GNU/Linux (dwarf 2) with no regressions.
>  > Tested on PPC NetBSD (stabs) with no regressions.
>  > Tested on IRIX and all the warnings, and many failures, disappeared.
>  > See gdb/1519 for how to exercise the bug.
>  > 
>  > ok?
> 
> ok. Does it still fix shlibs/1237 and shlibs/1280 too? Adam, could you
> check please?

Isn't that covered by the testsuite?  Sigh.

Andrew