Clear currently_expanding_gimple_stmt properly

Clear currently_expanding_gimple_stmt properly

commit a5883ba0de68efad36db145e75c86394d8bd44ea
Author: Michael Matz <matz@gcc.gnu.org>
Date:   Tue Nov 24 15:37:32 2009 +0000

introduced currently_expanding_gimple_stmt, which was set and cleared in
expand_gimple_basic_block when expanding gimple statement to RTL.  But it
isn't cleared when expand_gimple_basic_block returns inside the loop.

	PR middle-end/104721
	* cfgexpand.cc (expand_gimple_basic_block): Clear
	currently_expanding_gimple_stmt when returning inside the loop.