[TableGen][GISel] Allow isTrivialOperatorNode to import patterns with isStore and a memory VT. (#137080) This removes the need to explicitly set isTruncStore on truncstorei8 and other similar PatFrags that include truncstore in their frags DAG. This allows some new patterns to be imported for AMDGPU as you can see in the changed test. The extra isTruncStore were added in ae2b36e8bdfa6, along with some other tablegen changes to look for MemoryVT along with isTruncStore. I did not remove the code, because I'm not sure if any out of tree users have become dependent on it. It's no longer exercised in tree.
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