[Patch] Kill LDTLSCleanup, let MachineCSE clean up local-dynamic TLS (PR13783)

[Hans Wennborg]

Hi all,

The attached patch attempts to fix PR13783. The idea is to make it
possible for MachineCSE (and cse during sdag construction) to clean up
redundant TLS_base_addr instructions, rather than having a custom pass
do it.

To accomplish this, I have changed TLS_base_addr to define a vreg
rather than placing its result in a physical register, and then expand
to a call and a mov in MC lowering.

I'm not super confident about the codegen parts of LLVM, so please
take a close look.

Thanks,
Hans
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