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We do not model them as a type anymore, but simply annotate
compound_member entities with a bit offset and bit size.

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.

- Semantic was strange: shallow checking for pointers, deep checking for
  structs (because no real solution in case of cycles was implemented)
- Implementation was incomplete/buggy
- Nobody was using it anyway

Makes static analysis (LLVM's scan-build) happy.

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

The global type is final, so the next test bails out.

Accordingly remove repr_class from entities.

In particular this ensures that the backend has segments for the PIC symbols and trampolines.

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

We get a clean SIGSEGV anyway, if they're not fulfilled

So all files in libFirm do this consistently

Now we get a nice crash.

- do not record properties on irgs anymore, always do it on the irgs
  entity; entity properties have to be a superset of the entities method
  type properties.
- Remove special irg_inline_property and use mtp_additional_properties
  instead

Remove now redundant (and sometimes wrong) location info from the panic messages.

Add wrapper macros for pset_first() and pset_next(), which have the return type as additional parameter.

This is used to implement C99 "inline"/GNU89 "extern inline" ie. an
entity which is externally defined but where we know an inlineable
definition anyway.

This commit removes the strange differentiation between
ir_visibility_external and ir_visibility_default. We now only have
ir_visibility_external for all symbols visible across compilation units.
You may or may not attach graphs/initializers to them.