PR target/82498
	* fold-const.c (fold_binary_loc) <bit_rotate>: Code cleanups,
	instead of handling MINUS_EXPR twice (once for each argument),
	canonicalize operand order and handle just once, use rtype where
	possible.  Handle (A << B) | (A >> (-B & (Z - 1))).

	* gcc.dg/tree-ssa/pr82498.c: New test.

From-SVN: r253709