[AArch64][GlobalISel] Add support for TLS for ELF (#220236)
Mirror the existing DAGISel lowering for the TLS access sequences.
'AArch64 local-dynamic TLS cleanup pass' moved to
`AArch64PassConfig::addMachineSSAOptimization()` hook to make it running
for both instruction selection pipelines.
The generated by GlobalISel code matches DAGISel for the existing TLS
test cases.