darwin-ppc gets the alignment of nested structs wrong if they contain long long or double members.

The apple compiler, gcc version 4.0.1 (Apple Computer, Inc. build 5247)
does it 'correctly'.

Here an example for a wrong alignment:

struct A {long long a; unsigned char b;};
struct D {unsigned char y; struct A x; unsigned char z;};
struct E {long long d; unsigned char e;};

struct y { struct A b2; struct D b3; struct E b4;};

The apple output of sizeof(y) is 56, the current fsf gcc head gives: 64.

I put a few sample test cases into gcc.target/powerpc/darwin-abi-3...11.c on main.