gcc/
	PR tree-optimization/53881
	* tree-cfg.c (group_case_labels_stmt): Look up the basic block
	for each label and compare them instead of labels.

testsuite/
	PR tree-optimization/53881
	* gcc.dg/pr53881.c: Renamed to ...
	* gcc.dg/pr53881-1.c: ... this.
	* gcc.dg/pr53881-2.c: New test.

From-SVN: r189779