re PR middle-end/53887 (ICE in hoist_edge_and_branch_if_true, at tree-switch-conversi...

re PR middle-end/53887 (ICE in hoist_edge_and_branch_if_true, at tree-switch-conversion.c:79)

gcc/
	PR tree-optimization/53887
	* tree-cfg.c (group_case_labels_stmt): Make non-static.
	* tree-flow.h (group_case_labels_stmt): Add prototype.
	* tree-switch-conversion.c (process_switch): Use group_case_labels_stmt
	to pre-process every switch.

testsuite/
	PR tree-optimization/53887
	* gcc.dg/pr53887.c: New test.

From-SVN: r189389