1. GlobalISel: Add utilty for getting function argument live ins (details)
  2. [lldb/Test] Skip tests that try to get the remote environment (details)
  3. AMDGPU/GlobalISel: Select llvm.returnaddress (details)
Commit f8fb7835d6a5e2a75d412e1482fc1c039efef1f0 by arsenm2
GlobalISel: Add utilty for getting function argument live ins

Get the argument register and ensure there's a copy to the virtual
register. AMDGPU and AArch64 have similarish code to get the livein
value, and I also want to use this in multiple places.

This is a bit more aggressive about setting the register class than
the original function, but that's probably OK.

I think we're missing a few verifier checks for function live ins. I
noticed AArch64's calling convention code is not actually adding
liveins to functions, only the entry block (which apparently might not
matter that much?). There should probably be a verifier check that
entry block live ins are also live into the function. We also might
need a verifier check that the copy to the livein virtual register is
in the entry block.
The file was modifiedllvm/include/llvm/CodeGen/GlobalISel/Utils.h
The file was modifiedllvm/lib/CodeGen/GlobalISel/Utils.cpp
The file was modifiedllvm/test/CodeGen/AArch64/GlobalISel/select-returnaddress-liveins.mir
The file was modifiedllvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-call.ll
The file was modifiedllvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.h
The file was modifiedllvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-call-implicit-args.ll
The file was modifiedllvm/test/CodeGen/AMDGPU/GlobalISel/legalize-addrspacecast.mir
The file was modifiedllvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
The file was modifiedllvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
Commit ba3d84d82b750296c11e843365aa85962a561ad4 by Jonas Devlieghere
[lldb/Test] Skip tests that try to get the remote environment

We don't support getting the remote environment. The gdb remote protocol
has no packet for that.
The file was modifiedlldb/test/API/python_api/sbplatform/
The file was modifiedlldb/test/API/python_api/sbenvironment/
Commit 89011fc3c965811bbc3b6a0770c9d94bb264ad3f by arsenm2
AMDGPU/GlobalISel: Select llvm.returnaddress
The file was modifiedllvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
The file was addedllvm/test/CodeGen/AMDGPU/GlobalISel/inst-select-returnaddress.mir
The file was modifiedllvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
The file was modifiedllvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
The file was modifiedllvm/test/CodeGen/AMDGPU/returnaddress.ll