re PR tree-optimization/59387 (wrong code (hangs) at -Os on x86_64-linux-gnu)

re PR tree-optimization/59387 (wrong code (hangs) at -Os on x86_64-linux-gnu)

	PR tree-optimization/59387
	* tree-scalar-evolution.c: Include gimple-fold.h and gimplify-me.h.
	(scev_const_prop): If folded_casts and type has undefined overflow,
	use force_gimple_operand instead of force_gimple_operand_gsi and
	for each added stmt if it is assign with
	arith_code_with_undefined_signed_overflow, call
	rewrite_to_defined_overflow.
	* tree-ssa-loop-im.c: Don't include gimplify-me.h, include
	gimple-fold.h instead.
	(arith_code_with_undefined_signed_overflow,
	rewrite_to_defined_overflow): Moved to ...
	* gimple-fold.c (arith_code_with_undefined_signed_overflow,
	rewrite_to_defined_overflow): ... here.  No longer static.
	Include gimplify-me.h.
	* gimple-fold.h (arith_code_with_undefined_signed_overflow,
	rewrite_to_defined_overflow): New prototypes.

	* gcc.c-torture/execute/pr59387.c: New test.

From-SVN: r206583