PR tree-optimization/65418
	* tree-ssa-reassoc.c (extract_bit_test_mask): If there
	are casts in the first PLUS_EXPR operand, ensure tbias and
	*totallowp are in the inner type.

	* gcc.c-torture/execute/pr65418-1.c: New test.
	* gcc.c-torture/execute/pr65418-2.c: New test.

From-SVN: r221434