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The xfail for "*-*-*" here, set in r14-4089-gd45ddc2c04e471 "tree-optimization/111294 - backwards threader PHI costing" was somewhat too general and made this test XPASS for a number of targets. The common factor for those targets is that they either explicitly or by default define LOGICAL_OP_NON_SHORT_CIRCUIT as 0 (see fold-const.cc). Instead of changing *-*-* to a seemingly random set of xfailed targets or inventing a new testsuite effective-target predicate for logical-op-short-circuited targets or the opposite, let's just force a setting that removes the need for the xfail for all targets, by overriding with --param=logical-op-non-short-circuit=0. * gcc.dg/uninit-pred-9_b.c: Remove xfail for line 20. Pass --param=logical-op-non-short-circuit=0. Comment why.
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