[Bug testsuite/85106] Add scan-ltrans-tree-dump and scan-wpa-ipa-dump

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85106

--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 43789
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43789&action=edit
Tentative followup patch that adds scan-offload-rtl-dump