Allow bundling of .bss.* sections that are the result of -fdata-sections
so that rela sections referencing data in bss sections by section symbol
can be replaced with the object symbol so it can be linked to the existing
data object in the kernel.

Signed-off-by: Seth Jennings <sjenning@redhat.com>

The section header size is calculated at output time by libelf
and we use it as a read-only value from read files.

With the next patch we are changing the size of the .rela__bug_table
section.  Lets use d_size instead since it is the value that tells
libelf how to calculate sh_size at output time.

Signed-off-by: Seth Jennings <sjenning@redhat.com>

This commit adds a new function to properly handle the bug table.
It works by going through .rela__bug_table, after the changed
function symbols have already been marked, and rewrites the section
including only the relocations pertaining to bug entries for
changed functions.

The __bug_table section itself is not modified resulting in
"blank" bug entries: ones whose IP and filename pointers will
not be relocated and, therefore, will be zero.  While a waste
of space, it simplifies the code not to remove these blank
entries. They do no harm.

Signed-off-by: Seth Jennings <sjenning@redhat.com>

While debugging the code for the bug table logic, I found it useful to
know which rela section and entry the error occurred on.

Signed-off-by: Seth Jennings <sjenning@redhat.com>

Signed-off-by: Seth Jennings <sjenning@redhat.com>