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All other structs holding a register class call it cls, too.

ia32: Directly put the bitfields in ia32_attr_t instead of having another struct needlessly wrapping them.

This way we do not need to create a new Proj, when we replace a Store + IncSP by a Push.

Most others were unused and removed already.
These three were used, but lost their meaning long ago when the users of the others were removed.

The previous approach put the irg link into the block attributes, so
while saving memory an extra indirection was necessary. Some testing
with valgrind massif+callgrind revealed that a direct link increses peak
memory usage by ~1% while also increasing runtime by ~1%. More
importantly the code gets a bit simpler and some strange corner cases can be
removed with the direct link.

This fixes backend/peephole.c.

Assembler/linker never supported this anyway.

It has been empty for nearly all systems. People who used to put stuff
in config.h can still create a config.h on their own and inject
-include (gcc) or /FI (msvc) into their CPPFLAGS.

An ia32 Load always loads into a GP register.

There is not (middleend) Start node in a graph at this point.

Just state the copyright and the project the files belong to. You can
then find the COPYING file for the whole project.

cleanup: Remove pointless assert(is_${NODE}(x)) just before get_${NODE}_${FOO}(x), which do the same assert.