[SDAG] Don't handle non-canonical libcalls in SDAG lowering (#171114) SDAG currently tries to lower certain libcalls to ISD opcodes. However, many of these are already canonicalized from libcalls to intrinsic in the middle-end (and often already emitted as intrinsics in the front-end). I believe that SDAG should not be doing anything for such libcalls. This PR just drops a single libcall to get consensus on the direction, as these changes need a non-trivial amount of test updates. A lot of the remaining libcalls *should* probably also be canonicalized to intrinsics in the middle-end when annotated with `memory(none)`, but that would require additional work in SimplifyLibCalls.
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