[Bug default/27421] New: Improve DW_FORM_implicit_const handling in checksum_die/die_eq_1

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27421

            Bug ID: 27421
           Summary: Improve DW_FORM_implicit_const handling in
                    checksum_die/die_eq_1
           Product: dwz
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: default
          Assignee: nobody at sourceware dot org
          Reporter: vries at gcc dot gnu.org
                CC: dwz at sourceware dot org
  Target Milestone: ---

In commit 4100572 "Handle DW_FORM_implicit_const for DW_AT_decl_line", I added
code to ensure that for an attribute DW_AT_decl_line, same-valued
DW_FORM_implicit_const and DW_FORM_data1 are hashed equally in checksum_die,
and found to be equal in die_eq_1.

It would be good to cover this for more attributes.  This was discussed on the
ml here:
- https://sourceware.org/pipermail/dwz/2021q1/000872.html
- https://sourceware.org/pipermail/dwz/2021q1/000873.html

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