Duncan P. N. Exon Smith aa687a3d4c Reapply "IR: Simplify DIBuilder's HeaderBuilder API, NFC"
This reverts commit r226542, effectively reapplying r226540.  This time,
initialize `IsEmpty` in the copy and move constructors as well.

llvm-svn: 226545
2015-01-20 05:02:42 +00:00
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