gdb/dwarf: remove existing_cu parameter of load_full_comp_unit

Following the previous patch, all callers now pass the same thing:

    per_objfile->get_cu (this_cu)

Remove that parameter and to the call in the function itself.

Change-Id: Iafd36b058d7b95efae518bb65035c6a03728b018
Approved-By: Tom Tromey <tom@tromey.com>
1 file changed