re PR tree-optimization/48641 (ICE: verify_flow_info failed: Wrong frequency of block 77 -419530 with -O -fno-tree-ccp -fno-tree-copy-prop)


	PR middle-end/48641 
	* tree-ssa-threadupdate.c (redirect_edges): Watch for overflow.
	* gcc.dg/compile/pr48641.c: New file.

From-SVN: r182693