target/ppc: use tcg ops for neg instruction

Signed-off-by: NNikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>

target/ppc/translate.c

@@ -1483,7 +1483,10 @@ static inline void gen_op_arith_neg(DisasContext *ctx, bool compute_ov)
 
 static void gen_neg(DisasContext *ctx)
 {
-    gen_op_arith_neg(ctx, 0);
+    tcg_gen_neg_tl(cpu_gpr[rD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)]);
+    if (unlikely(Rc(ctx->opcode))) {
+        gen_set_Rc0(ctx, cpu_gpr[rD(ctx->opcode)]);
+    }
 }
 
 static void gen_nego(DisasContext *ctx)