Michael Gottesman 5590c7b526 [sil] Add a move_value instruction. ...

This is a new instruction that can be used by SILGen to perform a semantic move
in between two entities that are considered separate variables at the AST
level. I am going to use it to implement an experimental borrow checker.

This PR contains the following:

1. I define move_value, setup parsing, printing, serializing, deserializing,
   cloning, and filled in all of the visitors as appropriate.
2. I added createMoveValue and emitMoveValueOperation SILBuilder
   APIs. createMoveValue always creates a move and asserts is passed a trivial
   type. emitMoveValueOperation in contrast, will short circuit if passed a
   trivial value and just return the trivial value.
3. I added IRGen tests to show that we can push this through the entire system.

This is all just scaffolding for the instruction to live in SIL land and as of
this PR doesn't actually do anything.

2021-09-12 11:07:42 -07:00

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