re PR rtl-optimization/69592 (Compile-time and memory-use hog in combine)

re PR rtl-optimization/69592 (Compile-time and memory-use hog in combine)

	PR rtl-optimization/69592
	* rtlanal.c (nonzero_bits_binary_arith_p): New inline function.
	(cached_nonzero_bits): Use it instead of ARITHMETIC_P.
	(num_sign_bit_copies_binary_arith_p): New inline function.
	(cached_num_sign_bit_copies): Use it instead of ARITHMETIC_P.

	* gcc.dg/pr69592.c: New test.

From-SVN: r233059