[Bug target/71061] New: [ARM] is not setting instruction length for pop* patterns

[jiwang at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71061

            Bug ID: 71061
           Summary: [ARM] is not setting instruction length for pop*
                    patterns
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: minor
          Priority: P3
         Component: target
          Assignee: jiwang at gcc dot gnu.org
          Reporter: jiwang at gcc dot gnu.org
  Target Milestone: ---
            Target: arm*

This is causing wrong size calculation and may affect some rtl pass, for
example bb-order where copy_bb_p needs accurate insn length info.

This have eventually part of the reason for
https://gcc.gnu.org/ml/gcc-patches/2016-05/msg00639.html where bb-order failed
to do the bb copy.

For the fix, I think we should extend arm_attr_length_push_multi to pop*
pattern.