Testsuite fixes for C++11 alignof change.

gcc/testsuite:
	* c-c++-common/attr-aligned-1.c: Use __alignof__ in C++11.
	* g++.dg/cpp0x/alignas4.C: Expect 4-byte alignment on x86.

From-SVN: r259606

gcc/testsuite/c-c++-common/attr-aligned-1.c

@@ -17,8 +17,8 @@ main ()
 }
 
 #if defined(__cplusplus) && __cplusplus >= 201103L
-static_assert (alignof (S) == 2 * alignof (double), "alignment of S");
-static_assert (alignof (T) == 2 * alignof (double), "alignment of T");
-static_assert (alignof (const S) == 2 * alignof (double), "alignment of const S");
-static_assert (alignof (const T) == 2 * alignof (double), "alignment of const T");
+static_assert (alignof (S) == 2 * __alignof__ (double), "alignment of S");
+static_assert (alignof (T) == 2 * __alignof__ (double), "alignment of T");
+static_assert (alignof (const S) == 2 * __alignof__ (double), "alignment of const S");
+static_assert (alignof (const T) == 2 * __alignof__ (double), "alignment of const T");
 #endif

gcc/testsuite/g++.dg/cpp0x/alignas4.C

 // PR c++/59012
 // { dg-do compile { target c++11 } }
-// { dg-final { scan-assembler "align 8" { target { { i?86-*-* x86_64-*-* } && { ! *-*-darwin* } } } } }
+// { dg-final { scan-assembler "align 8" { target { { i?86-*-* x86_64-*-* } && { { ! ia32 } && { ! *-*-darwin* } } } } } }
+// { dg-final { scan-assembler "align 4" { target ia32 } } }
 
 template <class... T>
 struct A