re PR middle-end/85414 (ICE: in ix86_expand_prologue, at config/i386/i386.c:13810 with -Og -fgcse)
PR middle-end/85414 * simplify-rtx.c (simplify_unary_operation_1) <case SIGN_EXTEND, case ZERO_EXTEND>: Pass SUBREG_REG (op) rather than op to gen_lowpart_no_emit. From-SVN: r259649
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