[PATCH] NVTPX: Use MapMetadata() instead of incorrect, custom logic

[Duncan P. N. Exon Smith]

NVTPX has its own `remapMDNode()` which (1) does strange things and
(2) is bitrotting.

The first patch removes the strange, invalid logic to replace a
global variable declaration (see the actual
`DIBuilder::createGlobalVariable()` for what the field *really*
does -- ignore the comment) with a ConstantInt representing the
address space.  (It'll mangle any other metadata schema that
happens to reference global variables, as well.)

The second patch rewrites the logic to use `MapMetadata()`, so that
this code doesn't continue to bitrot.

These aren't really NFC, but it doesn't cause any test failures.

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