[PATCH] Fix PR37795

[Paolo Bonzini]

> +       if (!(t = combine_comparisons (TRUTH_AND_EXPR, code1, code2,

TRUTH_ANDIF_EXPR, and likewise below.  The difference being...

        /* In a short-circuited boolean expression the LHS might be
           such that the RHS, if evaluated, will never trap.  For
           example, in ORD (x, y) && (x < y), we evaluate the RHS only
           if neither x nor y is NaN.  (This is a mixed blessing: for
           example, the expression above will never trap, hence
           optimizing it to x < y would be invalid).  */

        /* If the comparison was short-circuited, and only the RHS
           trapped, we may now generate a spurious trap.  */

Paolo