[PATCH] Fix a bug that propagation in recursive function uses wrong aggregate lattice (PR ipa/93084)

[Feng Xue OS]

When checking a self-recursively generated value for aggregate jump
function, wrong aggregate lattice was used, which will cause infinite
constant propagation. This patch is composed to fix this issue. 

2020-01-03  Feng Xue  <fxue@os.amperecomputing.com>

        PR ipa/93084
        * ipa-cp.c (self_recursively_generated_p): Find matched aggregate
        lattice for a value to check.
        (propagate_vals_across_arith_jfunc): Add an assertion to ensure
        finite propagation in self-recursive scc.

Feng
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