[MemorySSA] Clean up single value phis.
MemoryPhis with a single value are correct, but can lead to errors when updating. Clean up single entry Phis newly added when cloning blocks. Resolves PR46574.
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MemoryPhis with a single value are correct, but can lead to errors when updating. Clean up single entry Phis newly added when cloning blocks. Resolves PR46574.