[NFC][RemoveDIs] Switch ConstantExpr::getAsInstruction to not insert (#84737) Because the RemoveDIs work is putting a debug-info bit into BasicBlock::iterator and iterators are needed for insertion, the getAsInstruction method declaration would need to use a fully defined instruction-iterator, which leads to a complicated header-inclusion-order problem. Much simpler to instead just not insert, and make it the callers problem to insert. This is proportionate because there are only four call-sites to getAsInstruction -- it would suck if we did this everywhere. --------- Merged by: Stephen Tozer <stephen.tozer@sony.com>
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