Work Around SIL Crash

There appears to be an unhandled case where a _read accessor yields the result of an unsafe addressor. rdar://102247545 tracks the SIL-side problem. For now, swap the _read access for a plain getter.

Author: CodaFi

Sources/SwiftSyntax/Raw/RawSyntax.swift

@@ -133,7 +133,7 @@ public struct RawSyntax {
   }
 
   internal var payload: RawSyntaxData.Payload {
-    _read { yield rawData.payload }
+    get { rawData.payload }
   }
 }