Struct size tooltips are incorrect for x86-64

QtCreator displays structure sizes in tooltips when you hover mouse over the structure name in the structure definition. Those sizes are incorrect in a few contexts.

For example, in these definitions:

#include <cstdint>

struct A
{
	std::uint64_t a;
	std::uint8_t b;
};

struct B :
	public A
{
	std::uint8_t c;
};

hovering mouse over A shows its size is 12 bytes, and B is 16 bytes. gcc shows 16 and 24, respectively (https://gcc.godbolt.org/z/YzGf5EeGn).

Another example:

#include <cstdint>

struct A
{
	std::uint8_t b;

	virtual ~A();
};

struct B :
	public A
{
	std::uint8_t c;
};

Here QtCreator shows 8 bytes for each struct while gcc shows 16 (https://gcc.godbolt.org/z/Wvnz6xd6f).

It looks like the struct sizes are calculated for 32-bit x86 target, even though the actual build target is x86-64.