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[ELF] Return the section name when calling getSymbolName on a section symbol.

Description

[ELF] Return the section name when calling getSymbolName on a section symbol.

Summary:
Previously, llvm-nm would report symbols for .debug and .note sections as: '?' with an empty section name:

00000000 ?
00000000 ?
...

With this patch the output more closely resembles GNU nm:

00000000 N .debug_abbrev
00000000 n .note.GNU-stack
...

This patch calls getSectionName for sections that belong to symbols of type ELF::STT_SECTION, which returns the name of the section from the section string table.

Reviewers: Bigcheese, davide, jhenderson

Reviewed By: davide, jhenderson

Subscribers: rupprecht, jhenderson, llvm-commits

Differential Revision: https://reviews.llvm.org/D57105