bpf: gas: add negi and neg32i tests

bpf: gas: add negi and neg32i tests

gas/ChangeLog:

2023-07-26  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* testsuite/gas/bpf/alu.s: Add test for NEGI and NEG32I.
	* testsuite/gas/bpf/alu32.s: Likewise.
	* testsuite/gas/bpf/alu-pseudoc.s: Likewise.
	* testsuite/gas/bpf/alu32-pseudoc.s: Likewise.
	* testsuite/gas/bpf/alu.d: Add expected results.
	* testsuite/gas/bpf/alu-be.d: Likewise.
	* testsuite/gas/bpf/alu-pseudoc.d: Likewise.
	* testsuite/gas/bpf/alu-be-pseudoc.d: Likewise.
	* testsuite/gas/bpf/alu32.d: Likewise.
	* testsuite/gas/bpf/alu32-be.d: Likewise.
	* testsuite/gas/bpf/alu32-be-pseudoc.d: Likewise.