[ELF] Recognize additional relocation types
[ELF] Recognize additional relocation types

These are generated by the linker itself and it shouldn't treat
them as unrecognized. This was introduced in r315552 and is triggering
an error when building UBSan shared library for i386.

Differential Revision: https://reviews.llvm.org/D38899

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@315737 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld