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As found by a c6x build failure, INSN_ANNULLED_BRANCH_P and RTL_CONST_CALL_P both resolve to the same bit for CALL_INSNs. I want to fix this by restricting INSN_ANNULLED_BRANCH_P to JUMP_INSNs, since annulling the slots for a call or a plain insn doesn't really make sense. The following has passed stage2-gcc on sparc64-linux host (full build still in progress), with --enable-checking=yes,rtl. It surely needs more than that, and I'm asking for help from the relevant maintainers to give this a try. r~
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