message: [LLDB] - Simplify. NFC.
  There are several places that call `FindRanges`,
  all of them use `Slide` to adjust the ranges found
  by the base address.
  All except one, which does the same manually in a loop.
  Patch updates it to use `Slide` for consistency.
diff: @@ -3336,14 +3336,7 @@ VariableSP SymbolFileDWARF::ParseVariableDIE(const SymbolContext &sc,
  // All DW_AT_start_scope are relative to the base address of the
  // compile unit. We add the compile unit base address to make
  // sure all the addresses are properly fixed up.
  - for (size_t i = 0, count = dwarf_scope_ranges.GetSize();
  - i < count; ++i) {
  - const DWARFRangeList::Entry &range =
  - dwarf_scope_ranges.GetEntryRef(i);
  - scope_ranges.Append(range.GetRangeBase() +
  - die.GetCU()->GetBaseAddress(),
  - range.GetByteSize());
  - }
  + dwarf_scope_ranges.Slide(die.GetCU()->GetBaseAddress());
  } else {
  // TODO: Handle the case when DW_AT_start_scope have form
  // constant. The
  