bfc: brainfuck compiler for x86_64

about:
	bfc is a simple compiler for brainfuck for x86_64 programming language since
	my bfi (brainfuck interpreter) was not fast enough

	it is a compiler in the sense of bfc produces the assembly code for x86_64
	arch in gnu style syntax.

	bfc does not produce object code (elf), that's another project i want to make,
	nas: naive assembler, so whenever nas is ready, bfc will be a full compiler as
	normally compilers are known

notes:
	- since bfc is not complete yet (missing the assembler), you
	need to specify -S flag (it produces the assembly source code),
	once nas is ready -S flag will be optional
	- in the current state of the project there are not brainfuck programs
	in the code base, yet you can download a few by running make pull-asm (see makefile)