Joe Groff b5f36f7bea IRGen: Use known value witnesses in generic metadata patterns. ...

We were unnecessarily conservative here; generic metadata patterns support indirectable references
to value witness tables exported by the standard library, so if we have a fixed-layout generic
type that matches a known value witness table layout, use that instead of generating a new
value witness table.

2019-08-09 12:52:22 -07:00

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