[llvm-readobj] - Refine the LLVM-style output to be consistent.

[llvm-readobj] - Refine the LLVM-style output to be consistent.

Our LLVM-style output was inconsistent.
This patch changes the output in the following way:

SHT_GNU_verdef { -> VersionDefinitions [
SHT_GNU_verneed { -> VersionRequirements [
Version symbols [ -> VersionSymbols [
EH_FRAME Header [ -> EHFrameHeader {

Differential revision: https://reviews.llvm.org/D68636

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375095 91177308-0d34-0410-b5e6-96231b3b80d8