cmd/compile/internal/types: remove misleading comment

The runtime's knowledge of these constants was removed in CL 261364.

Change-Id: I65e5a5ab084c6301eee1c9791bc76df9b824e466
Reviewed-on: https://go-review.googlesource.com/c/go/+/463754
Run-TryBot: Matthew Dempsky <[email protected]>
Reviewed-by: Keith Randall <[email protected]>
Reviewed-by: Keith Randall <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>

Author: mdempsky

src/cmd/compile/internal/types/alg.go

@@ -13,7 +13,6 @@ type AlgKind int
 //go:generate stringer -type AlgKind -trimprefix A alg.go
 
 const (
-	// These values are known by runtime.
 	ANOEQ AlgKind = iota
 	AMEM0
 	AMEM8