gimple-fold: Fix up fputs -> fwrite folding [PR108988]

gimple-fold: Fix up fputs -> fwrite folding [PR108988]

gimple_fold_builtin_fputs when folding fputs into fwrite emits the third
argument (INTEGER_CST) with incorrect type - get_maxval_strlen or c_strlen
return ssizetype, while fwrite argument is size_type_node.
The following patch fixes that, I've skimmed through the rest of
gimple-fold.cc and in all other places get_maxval_strlen/c_strlen result
was fold_converted to size_type_node already (or GIMPLE cast stmt has been
emitted directly etc.).

2023-03-03  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/108988
	* gimple-fold.cc (gimple_fold_builtin_fputs): Fold len to
	size_type_node before passing it as argument to fwrite.  Formatting
	fixes.