[PATCH] IR: Allow 32-bits for lines in debug location

[Duncan P. N. Exon Smith]

Remove unnecessary restriction of 32-bits for line numbers in
`MDLocation`.

The rest of the debug info schema (with the exception of local
variables) uses 32-bits for line numbers.  As I introduce the
specialized nodes, it makes sense to canonicalize on one size or the
other.

Does this make sense to you folks, or would you rather canonicalize
on 24-bits?

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