[llvm-debuginfo-analyzer] Add support for DWARF v5 .debug_names section.

[CarlosAlbertoEnciso]

Extracted from llvm/tools/llvm-debuginfo-analyzer/README.txt
https://reviews.llvm.org/D125783#inline-1294142

The ELF reader use the public names information to create the
instructions LVLineAssembler. Instead of relying on DWARF
section names .debug_pubnames, and .debug_names, the
reader can collect the needed information while processing the
debug information.

If the object file supports the above section names, use them
to create the public names.

[llvmbot]

@llvm/issue-subscribers-debuginfo

Author: Carlos Alberto Enciso (CarlosAlbertoEnciso)

Extracted from [llvm/tools/llvm-debuginfo-analyzer/README.txt](https://github.com/llvm/llvm-project/blob/main/llvm/tools/llvm-debuginfo-analyzer/README.txt) https://reviews.llvm.org/D125783#inline-1294142

The ELF reader use the public names information to create the
instructions LVLineAssembler. Instead of relying on DWARF
section names .debug_pubnames, and .debug_names, the
reader can collect the needed information while processing the
debug information.

If the object file supports the above section names, use them
to create the public names.