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The main change here is splitting new_ir_mode into new_int_mode,
new_reference_mode and new_float_mode. You can now specify
mantissa+exponent size in new_float_mode. This also changes:

- x86 80bit-FP mode is NOT a ieee754 don't put "ieee754" into functions
  names that can also handle x86 80bit fps
- Move ieee_descriptor_t from tarval module into ir_mode struct
  (and rename to float_descriptor_t)
- Introduce mode_Q which represents binary128 from ieee754
- You can ask float modes for mantissa/exponent sizes now
- Fix endianess when emitting big float values in begnuas
- A bunch of long double fixes in ia32: the mode there has 10bytes
  (80bit) but the variables typically are 12 or 16 byte big
- This fixes some problems of sparc binary128 handling

There were no users and no tarval support anyway.

Use a special kind of entity on the frame type instead of a value_type
struct inside a method type. This makes replacement of function types
slightly easier (it's still a complex operation though) and handling in
the backend a bit more consistent since it's more or less a normal stack
access (with special offsets).

[r28375]

[r28340]

[r28220]

[r28219]

[r28218]

[r28217]

[r28216]

you can specify in the spec now for which nodes no standard import/export code is generated; fix bug with Proj nodes block

[r28215]

[r28210]

[r28127]

[r28062]

[r28061]

[r28037]

[r28030]

[r27467]

[r27153]

[r27131]

[r27130]

  clumsy. Bring back get_entity_visibility and set_entity_visibility

[r27039]

- Merge stickyness, visibility and variability into ir_linkage
- Add proper support for common symbols, weak symbols and C++ COMDAT stuff
- Mark OO-features type_visibility, peculiarity and allocation as deprecated
  OO feature will be separated from firm core into higher levels in the long run
- Rework, simplify and fix bugs in begnuas.c

[r27030]

[r26957]

[r26956]

[r26916]

- There's a new type_dbg_info* that allows you to attach debug names to types
- get_type_name and get_type_ident are now more. The new ir_print_type
  and the usual ir_printf("%+F", type) help in most usage cases.
  But you should be aware that names are not guaranteed to be unique anymore
  (or positively said: You don't have no trouble anymore building unique names
   in code that creates types)
- No need to specify mode for new pointer types anymore (you can still do it
  with set_type_mode)

[r26909]

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

[r26236]

[r25903]

- No exceptions for argument order in the Builtin constructor
- add missing functions for Borrow node

[r25888]

[r25886]

- Renamed type_walk_plus_frames to type_walk_prog.
- irio: Added support for the other segments

[r25598]

[r25578]