[SDAG] Read-only intrinsics must have WillReturn and !Throws attributes to be treated as loads (#99999) This change avoids deleting `!willReturn` intrinsics for which the return value is unused when building the SDAG. Currently, calls to read-only intrinsics not marked with `IntrWillReturn` cannot be deleted at the LLVM IR level but may be deleted when building the SDAG. These calls are unsafe to remove from the IR because the functions are `!willReturn` and should also be unsafe to remove fromthe SDAG for the same reason. This change aligns the behavior of the SDAG to that of LLVM IR. This change also requires that intrinsics not have the `Throws` attribute to be treated as loads for the same reason.
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