https://bugs.kde.org/show_bug.cgi?id=433898

            Bug ID: 433898
           Summary: arm64: Handle sp, lr, fp as DwReg in CfiExpr
           Product: valgrind
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

When copy_convert_CfiExpr_tree sees a DwReg on arm64 we simply call I_die_here;
This causes an issue in the case we really do have to handle that case (like in
the testcase from https://bugzilla.redhat.com/show_bug.cgi?id=1923493).

Handle the stack pointer (sp), link register (x30) and frame pointer (x29),
which we already keep in D3UnwindRegs, like we do for other architectures in
evalCfiExpr and copy_convert_CfiExpr_tree.

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