Beginnings of a Go interpreter. This implements basic and
Austin Clements authored
pointer types, supports literals, identifiers, type-checking
most unary and binary operators, "compiling" a few unary and
binary operators, and assignment and declaration statements.

R=rsc
APPROVED=rsc
DELTA=1751  (1751 added, 0 deleted, 0 changed)
OCL=31309
CL=31691
9211a7d4