epiphany.c (epiphany_rtx_cost): Compare with CC_N_NE / CC_C_LTU / CC_C_GTU carries no extra cost for its operands.

    gcc:
            * config/epiphany/epiphany.c (epiphany_rtx_cost): Compare
            with CC_N_NE / CC_C_LTU / CC_C_GTU carries no extra cost for
            its operands.
    gcc/testsuite:
            * gcc.target/epiphany/btst-1.c: New test.

From-SVN: r209319