Add -Rmodule-loading

Author: neonichu

Sources/SPMTestSupport/XCTAssertHelpers.swift

@@ -69,7 +69,7 @@ public func XCTAssertSwiftTest(
         try executeSwiftTest(
             path,
             configuration: configuration,
-            extraArgs: extraArgs + ["--very-verbose"],
+            extraArgs: extraArgs + ["--very-verbose", "-Xswiftc", "-Xfrontend", "-Xswiftc", "-Rmodule-loading"],
             Xcc: Xcc,
             Xld: Xld,
             Xswiftc: Xswiftc,