Don’t use unsafeFlags when building SwiftSyntax

The group info file was only being used when building SwiftSyntax as part of the toolchain. But nobody should be using SwiftSyntax from the toolchain, so it wasn’t providing any value.

Exclusivity checking is no longer a performance problem, so there’s no reason to disable it anymore.

Author: ahoppen

Package.swift

@@ -7,19 +7,8 @@ import Foundation
 /// to speed up the build or improve it.
 var swiftSyntaxSwiftSettings: [SwiftSetting] = []
 if ProcessInfo.processInfo.environment["SWIFT_BUILD_SCRIPT_ENVIRONMENT"] != nil {
-  let groupFile = URL(fileURLWithPath: #file)
-    .deletingLastPathComponent()
-    .appendingPathComponent("utils")
-    .appendingPathComponent("group.json")
   swiftSyntaxSwiftSettings += [
-    .define("SWIFTSYNTAX_ENABLE_ASSERTIONS"),
-    .unsafeFlags([
-      "-Xfrontend", "-group-info-path",
-      "-Xfrontend", groupFile.path,
-      // Enforcing exclusivity increases compile time of release builds by 2 minutes.
-      // Disable it when we're in a controlled CI environment.
-      "-enforce-exclusivity=unchecked",
-    ]),
+    .define("SWIFTSYNTAX_ENABLE_ASSERTIONS")
   ]
 }
 if ProcessInfo.processInfo.environment["SWIFTSYNTAX_ENABLE_RAWSYNTAX_VALIDATION"] != nil {