[Bug symtab/29942] New: Read some DWARF purely in background

["tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29942

            Bug ID: 29942
           Summary: Read some DWARF purely in background
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

Currently, dwarf2_build_psymtabs_hard works synchronously: it sends
some work to worker threads, but it waits for all work to be
completed before proceeding.

However, it doesn't have to work this way.  Instead, it could start
reading immediately; and then after starting the background tasks,
it could store a future that would then be waited on by
cooked_index_functions::read_partial_symbols.

I think the main benefit to doing this would be that "attach"
might appear to be faster.  In particular work like downloading
from debuginfod could be done while other threads are scanning
the DWARF.

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