Duncan P. N. Exon Smith c49984db99 BitcodeReader: Use getMD/getMDOrNull helpers consistently, almost NFC
The only functionality change was removing an error check from the
BitcodeReader (and an assertion from DILocation::getImpl) that is
already caught by Verifier::visitDILocation.  The Verifier is a better
place for this anyway, and being inconsistent with other subclasses of
MDNode isn't serving anyone.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267267 91177308-0d34-0410-b5e6-96231b3b80d8
2016-04-23 03:55:14 +00:00
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