[ELF] - Tweak verneed.s test to use new llvm-readobj functionality
[ELF] - Tweak verneed.s test to use new llvm-readobj functionality

Previously this test performed check of binary data. Since
llvm-readobj currently able to dump all 3 types of version relative
sections, that can be used to make this test more transparent.
Patch do that.

Differential revision: http://reviews.llvm.org/D21024

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@272120 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld