Andrew Kelley f119092273 stage2: breaking AST memory layout modifications ...

ast.Node.Id => ast.Node.Tag, matching recent style conventions.

Now multiple different AST node tags can map to the same AST node data
structures. In this commit, simple prefix operators now all map top
SimplePrefixOp.

`ast.Node.castTag` is now preferred over `ast.Node.cast`.

Upcoming: InfixOp flattened out.

2020-07-15 18:15:59 -07:00

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