[tests] Migrate operator declarations to Swift 4 syntax in SILGen tests

Author: ahoppen

test/SILGen/Inputs/AppKit.swift

@@ -9,5 +9,5 @@ public func NSApplicationMain(
   return argv.withMemoryRebound(to:UnsafePointer<Int8>.self, capacity: Int(argc)) {
     argv in
     return __NSApplicationMain(argc, argv)
-  })
+  }
 }

test/SILGen/protocol_resilience.swift

@@ -5,10 +5,10 @@
 
 import resilient_protocol
 
-prefix operator ~~~ {}
-infix operator <*> {}
-infix operator <**> {}
-infix operator <===> {}
+prefix operator ~~~
+infix operator <*>
+infix operator <**>
+infix operator <===>
 
 public protocol P {}
 

test/SILGen/witnesses.swift

@@ -1,7 +1,7 @@
 
 // RUN: %target-swift-frontend -module-name witnesses -Xllvm -sil-full-demangle -emit-silgen %s -disable-objc-attr-requires-foundation-module -enable-sil-ownership | %FileCheck %s
 
-infix operator <~> {}
+infix operator <~>
 
 func archetype_method<T: X>(x: T, y: T) -> T {
   var x = x