Update ARM ELF relocations to ABI 2.09

Add R_ARM_IRELATIVE.

llvm-svn: 222817
diff --git a/llvm/test/tools/llvm-readobj/Inputs/relocs.py b/llvm/test/tools/llvm-readobj/Inputs/relocs.py
index ffddf3d..0a605ab 100644
--- a/llvm/test/tools/llvm-readobj/Inputs/relocs.py
+++ b/llvm/test/tools/llvm-readobj/Inputs/relocs.py
@@ -808,6 +808,7 @@
   R_ARM_ME_TOO                = 0x80
   R_ARM_THM_TLS_DESCSEQ16     = 0x81
   R_ARM_THM_TLS_DESCSEQ32     = 0x82
+  R_ARM_IRELATIVE             = 0xa0
 
 class Relocs_Elf_Mips(Enum):
   R_MIPS_NONE              =  0