[lldb][DWARF] Don't try to compute address range information of forward declarations (#144059) This fixes the error reported in https://github.com/llvm/llvm-project/pull/144037. When computing the aranges table of a CU, LLDB would currently visit all `DW_TAG_subprogram` DIEs and check their `DW_AT_low_pc`/`DW_AT_high_pc`/`DW_AT_ranges` attributes. If those don't exist it would error out and spam the console. Some subprograms (particularly forward declarations) don't have low/high pc attributes, so it's not really an "error". See DWARFv5 spec section `3.3.3 Subroutine and Entry Point Locations`: ``` A subroutine entry may have either a DW_AT_low_pc and DW_AT_high_pc pair of attributes or a DW_AT_ranges attribute whose values encode the contiguous or non-contiguous address ranges, respectively, of the machine instructions generated for the subroutine (see Section 2.17 on page 51). ... A subroutine entry representing a subroutine declaration that is not also a definition does not have code address or range attributes. ``` We should just ignore those DIEs.
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