The opt_manage framework didn't really do much except assuring that some
analysis info is computed before a pass starts. We can achieve this
simpler by providing an assure_irg_properties function.
This commit also fixes some places where analysis info was potentially
not invalidated before.

graph_properties are things that a transformation may destroy but which
can be easily recalculated.

graph_constraints are set after lowering phases have been running and
forbid certain constructs that no (later) transformation is allowed to construct

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

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

They're adding more noise than they provide gain in readability. They
also make extra work to keep up to date.

They have been unnecessary aliases for is_SymConst_addr_ent() and
get_SymConst_entity().

[r28369]

[r28338]

Put definition of get_base_sc() into .c file to remove the (non-standard) inline specifier from official header.

Most users of this function are inside teh same c file, so the performance hit is small.

[r28144]

[r28127]

[r28062]

[r28041]

[r28030]

- rework ir_phase API
(sorry for mixing these 2 things into 1 commit)

[r27285]

[r27191]

[r27189]

[r27145]

  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]

[r26956]

- 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]

[r26387]

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

[r26236]

[r25805]

- BugFix: put access mode into the analysis cache (cache not used yet)

[r25793]

[r25755]

- add aa_opt_no_alias_args and aa_opt_no_alias_args_global flags

[r25754]

[r25641]