This change deletes the C implementations of
the Go compiler and assembler from the master branch.

The Go implementations are a bit slower right now,
due mainly to garbage generated by taking addresses
of stack variables all over the place (it was C code,
after all). That will be cleaned up (mechanically) over the
next week or so, and things will get faster.

Change-Id: I66b2b3477aec8835f9960d0798f5752dcd98d08f