[VPlan] Update isUniformAcrossVFsAndUFs to account for sinking. Recipes can be sunk now. In those cases, the sunk recipes are outside the loop region, but may not be uniform across VF and UF. Update the code to only exit early if the recipe is defined before the region. Without DT available, the easiest way to check is just if it is in the entry/preheader block. Fixes https://github.com/llvm/llvm-project/issues/181002. Fixes https://github.com/llvm/llvm-project/issues/180781.
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