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

[Adrian Prantl]

LGTM.
-- adrian
> On Feb 9, 2015, at 1:23 PM, Duncan P. N. Exon Smith <dexonsmith at apple.com> wrote:
> 
> `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`?
> 
> <0001-IR-Take-uint64_t-in-DIBuilder-createExpression.patch>