re PR tree-optimization/59747 (wrong code at -Os and above on x86_64-linux-gnu in...

re PR tree-optimization/59747 (wrong code at -Os and above on x86_64-linux-gnu in 64-bit mode)

	PR tree-optimization/59747
	* ree.c (find_and_remove_re): Properly handle case where a second
	eliminated extension requires widening a copy created for elimination
	of a prior extension.
	(combine_set_extension): Ensure that the number of hard regs needed
	for a destination register does not change when we widen it.

	PR tree-optimization/59747
	* gcc.c-torture/execute/pr59747.c: New test.

From-SVN: r206638