[patch] Speed up find_pc_section

[Joel Brobecker]

> 2009-09-10  Paul Pluzhnikov  <ppluzhnikov@google.com>
> 
>         *minsyms.c (lookup_minimal_symbol_by_pc_section_1): Assert non-NULL
>         section.
>         (lookup_minimal_symbol_by_pc_section): Check for NULL section.
>         (lookup_minimal_symbol_by_pc): Adjust.

(I assume this has been regression-tested...)
Approved, please go ahead and commit.

-- 
Joel