abort dominance:calc_dfs_tree trunck configured for arm-elf target

[Graham Stott]

Michael

sf_erf.c: In function `erfcf':
sf_erf.c:16: Internal compiler error in calc_dfs_tree, at dominance.c:355

The following almost trival peice of code triggers an abort
in calc_dfs_tree because di->nodes == 7 and n_basic_blocks == 8

---------------------------sf_erf.c---------------------------------
extern float erfcf (float);

extern const float one,two;

float
erfcf(float x)
{
        int hx,ix;

        hx = one;
        ix = hx & 0x7fffffff;
        if(ix >= 0x7f800000)
            return (float)(((unsigned)hx>>31)<<1)+one/x;
        else
          return two;
}
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