remove unused

# Conflicts:
#	Tests/SwiftDriverTests/IncrementalCompilationTests.swift

Author: David Ungar

Tests/SwiftDriverTests/IncrementalCompilationTests.swift

@@ -615,11 +615,7 @@ extension IncrementalCompilationTests {
     #endif
   }
 
-  private func postCompileOutputs() -> [AbsolutePath] {
-    abort()
-  }
-
-  func testRenamingSwiftDeps() throws {
+ func testRenamingSwiftDeps() throws {
     try tryInitial(checkDiagnostics: false)
     tryNoChange(checkDiagnostics: false)
     tryNoChange(checkDiagnostics: true,