ELF/AArch64: Add a test for R_AARCH64_ABS64


git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@224013 91177308-0d34-0410-b5e6-96231b3b80d8
ELF/AArch64: Add a test for R_AARCH64_ABS32


git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@224014 91177308-0d34-0410-b5e6-96231b3b80d8