[mips][microMIPS] Add R_MICROMIPS_PC18_S3 relocation

Differential Revision: http://reviews.llvm.org/D15026


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267130 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed