[DynInst_API:] [dyninst/dyninst] 7acb76: Don't check for existing return type when parsing ...

[Tim Haines <noreply@xxxxxxxxxx>]

  Branch: refs/heads/master
  Home:   https://github.com/dyninst/dyninst
  Commit: 7acb76787c647a434301579e4e9baa3a59884eb4
      https://github.com/dyninst/dyninst/commit/7acb76787c647a434301579e4e9baa3a59884eb4
  Author: Tim Haines <thaines.astro@xxxxxxxxx>
  Date:   2023-09-05 (Tue, 05 Sep 2023)

  Changed paths:
    M symtabAPI/src/dwarfWalker.C

  Log Message:
  -----------
  Don't check for existing return type when parsing DWARF subprogram (#1509)

Since 8b400af5, functions are guaranteed to only be parsed once, so the
return type can never be set before the call here. Checking the return
type circularly invokes Symtab::parseTypesNow which deadlocks since
7f1e24d.