Invalid static assert

The existing static assert used in machine.h and psymodel.c is problematic.

#define STATIC_ASSERT_EQUAL_DIMENSION(A,B) \
{extern char static_assert_##A[dimension_of(A) == dimension_of(B) ? 1
: -1];(void) static_assert_##A;}

It creates a symbol and references it, meaning the symbol may not be
optimized away. In addition, while this is probably a compiler bug, it
does fail to compile when using the VC2012 beta with LTCG enabled.

My preferred definition for this static assertion is as follows:

#define STATIC_ASSERT_EQUAL_DIMENSION(A,B) \
enum {static_assert_##A = 1/((dimension_of(A) == dimension_of(B)) ? 1 : 0)}

This works, doesn't define anything, and fixes my build failure.

Please consider fixing this.

Thanks!
Doug

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