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The following streamlines and generalizes how we find the common base of the lookup ref and a kill ref when looking through aggregate copies. In particular this tries to deal with all variants of punning that happens on the inner MEM_REF after forwarding of address taken components of the common base. PR tree-optimization/121362 * tree-ssa-sccvn.cc (vn_reference_lookup_3): Generalize aggregate copy handling. * gcc.dg/tree-ssa/ssa-fre-105.c: New testcase. * gcc.dg/tree-ssa/ssa-fre-106.c: Likewise.
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