Hi All,

This patch adds shared machinery for detecting patterns having to do with
complex number operations.  The class ComplexPattern provides helpers for
matching and ultimately undoing the permutation in the tree by rebuilding the
graph.

Bootstrapped Regtested on aarch64-none-linux-gnu and no issues.

Ok for master?

Thanks,
Tamar

gcc/ChangeLog:

	* tree-vect-slp-patterns.c (complex_operation_t,class ComplexPattern):
	New.

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