[LoopRotate] Calls not lowered to calls should not block rotation.

[LoopRotate] Calls not lowered to calls should not block rotation.

83daa49758a1 made loop-rotate more conservative in the presence of
function calls in the prepare-for-lto stage. The code did not properly
account for calls that are no actual function calls, like calls to
intrinsics. This patch updates the code to ensure only calls that are
lowered to actual calls are considered inline candidates.