target/i386: fix translation for icount mode

This patch fixes the checking of boundary crossing instructions.
In icount mode only first instruction of the block may cross
the page boundary to keep the translation deterministic.
These conditions already existed, but compared the wrong variable.
Signed-off-by: NPavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Message-Id: <20180920071702.22477.43980.stgit@pasha-VirtualBox>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

target/i386/translate.c

@@ -8538,10 +8538,10 @@ static void i386_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
            chance to happen */
         dc->base.is_jmp = DISAS_TOO_MANY;
     } else if ((tb_cflags(dc->base.tb) & CF_USE_ICOUNT)
-               && ((dc->base.pc_next & TARGET_PAGE_MASK)
-                   != ((dc->base.pc_next + TARGET_MAX_INSN_SIZE - 1)
+               && ((pc_next & TARGET_PAGE_MASK)
+                   != ((pc_next + TARGET_MAX_INSN_SIZE - 1)
                        & TARGET_PAGE_MASK)
-                   || (dc->base.pc_next & ~TARGET_PAGE_MASK) == 0)) {
+                   || (pc_next & ~TARGET_PAGE_MASK) == 0)) {
         /* Do not cross the boundary of the pages in icount mode,
            it can cause an exception. Do it only when boundary is
            crossed by the first instruction in the block.