Duncan P. N. Exon Smith 50b75d5804 AsmWriter: Cleanup debug info fields with MDFieldPrinter, NFC
Move all the `MDNode` field helper methods into a new class,
`MDFieldPrinter`, and add helpers for integers, bools, and `DW_*`
symbolic constants.  This reduces a ton of code duplication, and makes
it more mechanical to update `AsmWriter` to print broken code in the
context of stricter accessors (like in r233322).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233337 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-27 00:17:42 +00:00
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