[lldb][ARM/AArch64] Update disasm flags to latest v8.7a ISA

Add optional memory tagging extension on AArch64.

Use isAArch64() instead of listing the AArch64 triples,
which fixes us not recognising aarch64_be.

Reviewed By: omjavaid

Differential Revision: https://reviews.llvm.org/D94084

GitOrigin-RevId: 801c7866e6d4fba81c97d27ca56c9e05ba7b157a
1 file changed