PATCH: implement printf call lowering in the NVPTX backend

[Eli Bendersky]

Hello,

This patch implements lowering of the printf call to the vprintf syscall in
the NVPTX backend. It is implemented as a target-specific IR pass that runs
before codegen. The pass builds the required data structure from the
varargs to pass to the vprintf calls.

Tests (IR to IR, and IR to PTX) included.

PTAL,
Eli
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