tcg/i386: Adjust type of tlb_mask

Because of its use on tgen_arithi, this value must be a signed
32-bit quantity, as that is what may be encoded in the insn.
The truncation of the value to unsigned for 32-bit guests is
done via the REX bit via 'trexw'.

Removes the only uses of target_ulong from this tcg backend.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/i386/tcg-target.c.inc

@@ -1966,7 +1966,7 @@ static TCGLabelQemuLdst *prepare_host_addr(TCGContext *s, HostAddress *h,
     int trexw = 0, hrexw = 0, tlbrexw = 0;
     unsigned mem_index = get_mmuidx(oi);
     unsigned s_mask = (1 << s_bits) - 1;
-    target_ulong tlb_mask;
+    int tlb_mask;
 
     ldst = new_ldst_label(s);
     ldst->is_ld = is_ld;
@@ -2011,7 +2011,7 @@ static TCGLabelQemuLdst *prepare_host_addr(TCGContext *s, HostAddress *h,
         tcg_out_modrm_offset(s, OPC_LEA + trexw, TCG_REG_L1,
                              addrlo, s_mask - a_mask);
     }
-    tlb_mask = (target_ulong)TARGET_PAGE_MASK | a_mask;
+    tlb_mask = TARGET_PAGE_MASK | a_mask;
     tgen_arithi(s, ARITH_AND + trexw, TCG_REG_L1, tlb_mask, 0);
 
     /* cmp 0(TCG_REG_L0), TCG_REG_L1 */