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

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

This fixes backend/long_double_arith.c.

This plugs a memory leak.

Commit d33e0668 accidentally disabled
varargs support unless long double support is enabled.

Also disable it by default for now until x87 support is more mature.

We can see that we need a frame entity if the the immediate has a
X86_IMM_FRAMEOFFSET relocation but no entity assigned yet.

be: Pass the input requirements directly to the constructors of nodes, which have a variable number of arguments.

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.

It pops a value from the stack, so this memory access should be represented in the graph.

Otherwise the frontend has to do this after asking the backend for its parameters, which is quite awkward.