re PR tree-optimization/17468 (Java garbage collector miscompiled at -O1 and higher)
PR tree-optimization/17468 * tree-ssa.c (verify_use, verify_phi_args, verify_ssa): Verify that definition inside a block precede uses. * tree-tailcall.c (adjust_return_value): Emit statements in the correct order. From-SVN: r87538
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