[X86] Remove combineVectorSignBitsTruncation and leave TRUNCATE ->...
[X86] Remove combineVectorSignBitsTruncation and leave TRUNCATE -> PACKSS/PACKUS to legalization/lowering Don't prematurely fold TRUNCATE nodes to PACKSS/PACKUS target nodes - we miss out on generic TRUNCATE folds. Helps some regressions from D152928 and #63946 Fixes #63710
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