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Only keep the basics necessary to emit text lines in beemitter.[ch] and
move all the other convenience stuff to beemithlp.[ch].

'thunk' is the current and default style to get the ip.
'pop' is the old way using 'call base; base: pop %reg'.

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

Now the ls_mode is respected by default, wich is more sensible, and '#' is used to emit a 32 bit register.

Calls+Jumps really use PC relative addresses even if they look the same
in the assembler. Create an immediate kind for that, this allows a
slightly simpler bemit_entity().

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.

This is not really a new entity type but merely a relocation type.
Handle it with a x86_immediate_kind.

This way we don't need a separate frame_entity field in the attribute
struct anymore. We can also use the immediate type to determine whether
we need to assign a fresh stackentity to a node.
This commit does not change the frame_use field, which is now a
duplicate way to indicate whether we need to assign a stackentity. This
currently requires a lot of asserts to ensure the two stay in sync. In
the future I'd like to use frame_use only for the special case when a
32bit or 64bit entity needs to be forced.

The flag has been superseded by the immediate kind.

It is now required to set a (relocation) kind when entity != NULL.
Adds IMM_ADDR, PICBASE_REL kinds to differentiate between absolute
addresses and picbase relative addresses. Maintain the no_picbase_adjust
flag in parallel for testing. We should be able to remove it in a
subsequent commit.

be: Factorise the code to emit an asm node and use a callback for each backend to output the operands.