This flag can be set on entities where the actual address isn't
known/compared against other address. This also fixes a bug where we
used the mach-o csrings section for global char arrays which need
distinct addresses.

It doesn't matter for correctness but looks nicer.

As of the switch to C99 libfirm uses too many features that are not
supported by microsoft visual c and I don't see any hope to support it
again.
Windows users can still switch to a gcc based toolchain (cygwin or msys)
or may have better luck with a proper C99 compiler (clang, icc, future
versions of msvc?)

It combines sched_add_before() and be_peephole_exchange().

Default initialisation just happens to set the correct value.

This is relevant for long doubles, which are 80 bits long, but take up
128 bits on the stack and in memory according to the AMD64 ABI.

This may make opt/reassoc033.c fail consistently instead of randomly.

... by rewriting stupid code.

tarval_convert_to() does not return tv_unknown or null pointer.

The following get_tarval_long(tv) has the same assertion internally.