Add a missing #include to fix the master-next build.
Add a missing #include to fix the master-next build.

The AddressLowering.cpp file uses LLVM's CommandLine.h but was not
explicitly including that header. It was implicitly pulled in via other
headers, but LLVM r296846 changed "llvm/ProfileData/InstrProf.h" to
stop including "llvm/IR/Metadata.h" and broke the chain that led to
CommandLine.h.

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