(reg_scan_mark_refs): XEXP (x, 0) in EXPR_LIST may be 0.
From-SVN: r5739
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@ -1584,6 +1584,7 @@ reg_scan_mark_refs (x, insn, note_flag)
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break;
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case EXPR_LIST:
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if (XEXP (x, 0))
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reg_scan_mark_refs (XEXP (x, 0), insn, note_flag);
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if (XEXP (x, 1))
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reg_scan_mark_refs (XEXP (x, 1), insn, note_flag);
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