stage2: hook up Zig AST to ZIR

* Introduce the concept of anonymous Decls
 * Primitive Hello, World with inline asm works
 * There is still an unsolved problem of how to manage ZIR instructions
   memory when generating from AST. Currently it leaks.
b4eac0414aAndrew Kelley committed on 6/18/2020, 9:12:56 PMparent4a38799
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