Revert r317046, "Object: Move some code from ELF.h into ELF.cpp."

This change resulted in a measured 1.5-2% perf regression linking
chrome.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317371 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed