accel/tcg: Correct "is this a TLB miss" check in get_page_addr_code()

In commit 71b9a453 we changed the condition we use
to determine whether we need to refill the TLB in
get_page_addr_code() to
    if (unlikely(env->tlb_table[mmu_idx][index].addr_code !=
                 (addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK)))) {

This isn't the right check (it will falsely fail if the
input addr happens to have the low bit corresponding to
TLB_INVALID_MASK set, for instance). Replace it with a
use of the new tlb_hit() function, which is the correct test.
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Message-Id: <20180629162122.19376-3-peter.maydell@linaro.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

accel/tcg/cputlb.c

@@ -957,8 +957,7 @@ tb_page_addr_t get_page_addr_code(CPUArchState *env, target_ulong addr)
 
     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
     mmu_idx = cpu_mmu_index(env, true);
-    if (unlikely(env->tlb_table[mmu_idx][index].addr_code !=
-                 (addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK)))) {
+    if (unlikely(!tlb_hit(env->tlb_table[mmu_idx][index].addr_code, addr))) {
         if (!VICTIM_TLB_HIT(addr_read, addr)) {
             tlb_fill(ENV_GET_CPU(env), addr, 0, MMU_INST_FETCH, mmu_idx, 0);
         }