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This fixes backend/subregister.c.

They previously used be_stack_layout but that structure will be remove
soon.

This allows us to properly implement the OS X calling conventions.

Otherwise the node directly produces the flags result.
This fixes backend/destam_flags4.c.

This plugs a memory leak.

If the cached nodes like NoReg_GP, ... had no keep edge and no users
then irgwalks could miss them leading for the iredges code to miss
initializing these nodes.

This fixes bug 161.

This is done by introducing a new new_global_entity() function for
constructing globals/adding a visibility argument to new_alias_entity().

This commit also abstracts the node types used for fxch/fdup/fpop/ffreep
by using callbacks in the x87_simulator_config.

Also remove the nonsensical parameter pn, which is the Proj num of the old flags producer, from the try_replace callback.

The Proj might exist already, so reuse it.
If it needs to be created, then do this once, not once per flags uers.

This adds two builtin kinds, ir_bk_va_start and ir_bk_va_arg. va_arg Builtins
are lowered in the lower_builtins pass with a function provided by the backend,
whereby most architectures can use be_default_lower_va_args. va_start Builtins
are lowered in the backend.

Note: This commit breaks all backends except for IA32. SPARC and AMD64 are
implemented in later commits. The ARM backend previously miscompiled variadic
functions, and will now throw a proper error.

All backends have similar empty Start nodes, which just provide registers.
So having one generic backend Start node to share some infrastructure is sensible.

Do not derive another mode from the mode of the value -- they are the same anyway.
I could trace this code back to when backend did not always use register wide modes for values.

It is like new_r_Proj(), but the mode is determined automatically from the out requirement of the predecessor.
This probably resolves some mode mismatches in untested code paths -- AMD64 backend and SPARC hard float, I'm looking at you!

This uses the newly introduced be_Relocation node to perform most PIC
transformations in ia32_pic.c. This introduces the elf and elf-no-plt
PIC modes. The "efl" mode does not work yet because the additional ebx
input makes calls register pressure unfaithful.