re PR tree-optimization/47290 (memory exhausted compiling a destructor with an infinite 'for (;;);' loop)

	PR tree-optimization/47290
	* tree-eh.c (infinite_empty_loop_p): New function.
	(cleanup_empty_eh): Use it.

	* g++.dg/torture/pr47290.C: New test.

From-SVN: r168974