[DebugInfo] Refactoring DIType::setFlags to DIType::cloneWithFlags, NFC
and using the latter in DIBuilder::createArtificialType and
DIBuilder::createObjectPointerType methods as well as introducing
mirroring DISubprogram::cloneWithFlags and
DIBuilder::createArtificialSubprogram methods.
The primary goal here is to add createArtificialSubprogram to support
a pass downstream while keeping the method consistent with the
existing ones and making sure we don't encourage changing already
created DI-nodes.
Reviewed By: aprantl
Differential Revision: https://reviews.llvm.org/D47615
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333806
91177308-0d34-0410-b5e6-
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