tests/tcg/multiarch: Adjust sigbus.c

With -cpu max and FEAT_LSE2, the __aarch64__ section will only raise
an alignment exception when the load crosses a 16-byte boundary.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230530191438.411344-20-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

tests/tcg/multiarch/sigbus.c

@@ -6,8 +6,13 @@
 #include <endian.h>
 
 
-unsigned long long x = 0x8877665544332211ull;
-void * volatile p = (void *)&x + 1;
+char x[32] __attribute__((aligned(16))) = {
+  0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
+  0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
+  0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
+  0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
+};
+void * volatile p = (void *)&x + 15;
 
 void sigbus(int sig, siginfo_t *info, void *uc)
 {
@@ -60,9 +65,9 @@ int main()
      * We might as well validate the unaligned load worked.
      */
     if (BYTE_ORDER == LITTLE_ENDIAN) {
-        assert(tmp == 0x55443322);
+        assert(tmp == 0x13121110);
     } else {
-        assert(tmp == 0x77665544);
+        assert(tmp == 0x10111213);
     }
     return EXIT_SUCCESS;
 }