[LLVM] Remove wrong DBG_VALUE instruction with one operand in AArch64 test case
AArch64 test case llvm/test/CodeGen/AArch64/branch-target-enforcement.mir is checking for invalid DBG_VALUE instruction with one operand(DBG_VALUE $lr). And this DBG_VALUE instruction is echoed from test case it self only.
Correct format of DBG_VALUE is given in below link:
Reviewers: dsanders, eli.friedman, jmorse, vsk
Reviewed By: dsanders
Subscribers: kristof.beyls, danielkiss, hiraditya, llvm-commits
Differential Revision: https://reviews.llvm.org/D78309