[X86][ISel] Improve VPTERNLOG matching for negated logic trees (#164863)

This patch extends VPTERNLOG pattern matching to handle cases where an
outer NOT wraps a pure logical tree, such as `~(A | B | C)`. By
recognizing these negated logic trees, the instruction selector can now
emit a single vpternlog instruction.

The change preserves the match for patterns like `(x != C1) & (x !=
C2)`, which also have the xor-with-all-ones pattern outside. The patch
conservatively peels the outer XOR-with-all-ones only when it directly
wraps a foldable logical operator (AND, OR, XOR, or ANDNP).

Resolves #163738

0 files changed, 0 insertions, 0 deletions