* predict.def: Add fortran loop preheader predictor.
	* gimple-fold.c (gimple_fold_stmt_to_constant_1): Properly
	fold IFN_BUILTIN_EXPECT with a known constant argument.
	* trans-stmt.c (gfc_trans_simple_do): Predict the edge.
	* gfortran.dg/predict-1.f90: New test.

From-SVN: r237533