[VPlan] Use Unknown instead of empty location in VPlanTransforms (#157702) The default values for DebugLocs in LoopVectorizer/VPlan were recently updated from empty DebugLocs to DebugLoc::getUnknown, as part of the DebugLoc Coverage Tracking work. However, there are some cases where we also pass an explicit empty DebugLoc, in many cases as a filler argument. This patch updates all of these to `getUnknown` for now, until either valid locations or a suitable categorization can be assigned to each instead. This change is NFC outside of DebugLoc coverage tracking builds.
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