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[DEBUGINFO, NVPTX] Emit correct debug information for local variables.

Description

[DEBUGINFO, NVPTX] Emit correct debug information for local variables.

Summary:
NVPTX target dos not use register-based frame information. Instead it
relies on the artificial local_depot that is used instead of the frame
and the data for variables must be emitted relatively to this
local_depot.

Reviewers: tra, jlebar, echristo

Subscribers: jholewinski, aprantl, JDevlieghere, llvm-commits

Differential Revision: https://reviews.llvm.org/D45963