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
Add an `LLVMContext &` to `ReplaceableMetadataImpl`, create a class that either holds a reference to an `LLVMContext` or owns a `ReplaceableMetadataImpl`, and use the new class in `MDNode`. - This saves a pointer in `UniquableMDNode` at the cost of a pointer in `ValueAsMetadata` (which didn't used to store the `LLVMContext`). There are far more of the former. - Unifies RAUW support between `MDNodeFwdDecl` (which is going away, see r226481) and `UniquableMDNode`. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226484 91177308-0d34-0410-b5e6-96231b3b80d8