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Also choose a signed integer type which is more typical for offsets.

Deduce the mode automatically from the given entity.

This removes the strange entity/type duality and we get rid of union symconst_symbol.

The tarval module has a maximally supported precision. Assert that no
modes with higher precision are created, otherwise the tarval module
will silently drop the higher bits on calculation. TODO: Change tarval
module to dynamically use smaller/bigger representations depending on
the mode.

Removed mode_LLs, mode_LLu, mode_Q for now as they are bigger than the
limit.

Directly reading tp->align breaks (at least) for array types.

CopyB is normally used to transfer data on the stack or to enable compound
value calling conventions. Exceptions don't happen in these cases.

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.

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

irgmod: Pass the new inputs to turn_into_tuple() instead of initialising them with Bad and setting them afterwards.

Let list_for_each_entry(), list_for_each_entry_reverse() and list_for_each_entry_safe() declare their iterator variables.

Old version used parameter.

Backends can configure CopyB lowering, so that it's possible to keep
CopyB nodes in a certain size range for special backend-specific
optimizations.  Furthermore, large CopyBs are turned into memcpy calls.