Maybe we should also rename "opt" to "trans" in the future...

The start block is not special block without any "real" instructions
anymore. In particular this means:

- There is no X_initial_exec Proj from the Start node anymore, "normal"
  cfopts are used for jumping out of the start block.
- The backend never had the special convention of the start block not
  containing actual code and used to fixup this discrpancy, no more
  fixup code needed now.
- The part_block() code got a bit more complicated because splitting the
  start block is tricky (previously part_block() simply failed in this
  case but was never used in the Start block because of its special
  convention)

Deduce the mode automatically from the given entity.

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

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.

This makes it consistent with other firm analyse functions. Also removes
the unnecessary return value.

public functions are already documented in their headers, no need to
repeat the comment at the definition site.

- cleanup ir_spec generation a bit

[r27251]

[r27145]

[r26778]

- SymConst's are now ALWAYS placed in the start block

[r26236]

[r22754]

[r21362]

[r19367]

[r19271]