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b943370653
Add verify checks for `MDType` subclasses and for `MDCompileUnit`. These new checks don't yet incorporate everything from `Verify()`, but at least they sanity check the operands. Also downcast accessors as possible. A lot of these accessors can't be downcast as far as we'd like because of arrays of typed objects (stored in a generic `MDTuple`) and `MDString`-based type references. Eventually I'll port over `DIRef<>` and `DITypedArray<>` from `DebugInfo.h` to clean those up as well. Updated bitrotted testcases separately in r233415 and r233443 to reduce churn on the off-chance this needs to be reverted. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233446 91177308-0d34-0410-b5e6-96231b3b80d8
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