re PR tree-optimization/51118 (ICE: tree check: expected tree that contains ‘typed’ structure, have ‘block’ in fold_checksum_tree, at fold-const.c:14160)

	PR tree-optimization/51118
	* fold-const.c (fold_checksum_tree): Check for TS_TYPED structure
	before using TREE_TYPE accessor on expr.

From-SVN: r181468