[PATCH] IR: Take uint64_t in DIBuilder::createExpression()

[Duncan P. N. Exon Smith]

`DIExpression` deals with `uint64_t`, so it doesn't make sense that
`createExpression()` is created from `int64_t`.  Switch to `uint64_t` to
unify them.

I've temporarily left in the `int64_t` version, which forwards to the
`uint64_t` version.  I'll delete it once I've updated the callers.

Just before I go down this road, can you confirm it's the correct
direction?  Or should `DIExpression` be changed to use `int64_t`?

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