disable test_enter on i386, it is broken

Many other tests fail, but this has an infinite loop with both
qemu-i386 and native execution (albeit on x86_64), so there is
something more going on.  I'm not going to debug it now, so just
disable the test.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

tests/test-i386.c

@@ -2047,6 +2047,10 @@ long enter_stack[4096];
 #define RBP "%%ebp"
 #endif
 
+#if !defined(__x86_64__)
+/* causes an infinite loop, disable it for now.  */
+#define TEST_ENTER(size, stack_type, level)
+#else
 #define TEST_ENTER(size, stack_type, level)\
 {\
     long esp_save, esp_val, ebp_val, ebp_save, i;\
@@ -2078,6 +2082,7 @@ long enter_stack[4096];
     for(ptr = (stack_type *)esp_val; ptr < stack_end; ptr++)\
         printf(FMTLX "\n", (long)ptr[0]);\
 }
+#endif
 
 static void test_enter(void)
 {