MFC r336664: lld: fix addends with partial linking

[ELF] Update addends in non-allocatable sections for REL targets when
creating a relocatable output.

LLVM PR: 37735
LLVM Differential Revision: https://reviews.llvm.org/D48929

PR: 225128, 228753
Obtained from: LLVM r336799 by Igor Kudrin