start work on aggregate types

The parser now has some code to parse the description
of structured types.

I tried to be even less specific than LLVM "type" by
creating just enough abstraction so that I can deal
with both AARCH64 and x64.  The base types used in the
definition of an aggregate are really just syntactic sugar
to give a structure a size and an alignment.  Only the
location of float components matters for the compilation.
In particular this means that the front-ends have to know
how the ABI works to pass/return small integer types.
This also means that the font-end has to be aware of the
layout of structures.

Chris Lattner has a proposition [1] for LLVM that is still
pending and goes in the direction of giving more control
of the ABI the front-end.

[1]: http://www.nondot.org/sabre/LLVMNotes/ExtendedIntegerResults.txt

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