llvm/test/MC/AArch64/ldr-pseudo-obj-errors.s: Add -triple=aarch64-linux. AArch64 is unaware of PECOFF for now.

FIXME: This should pass for also targeting aarch64-darwin.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211640 91177308-0d34-0410-b5e6-96231b3b80d8