[PATCH RFC 3/5] Make index reading functions more modular

[Tom Tromey]

>>>>> "Simon" == Simon Marchi <simon.marchi@ericsson.com> writes:

Simon> The read_gdb_index_from_section and read_debug_names_from_section
Simon> functions read the index content, as their names state, from sections of
Simon> object files.  A following patch will make it possible to read index
Simon> content from standalone files.

Simon> This patch therefore decouples the code that reads the index content
Simon> from object file sections from the code that processes that content.
Simon> Functions dwarf2_read_gdb_index and dwarf2_read_debug_names receive
Simon> callbacks that are responsible for providing the index contents (for
Simon> both the main file and the potential dwz file).

This callback style makes the code harder to read and understand; but
other than that this seems fine.

Tom