[Test] Reenable a test.

rdar://104021173

Author: nate-chandler

lib/SILOptimizer/UtilityPasses/UnitTestRunner.cpp

@@ -501,9 +501,11 @@ struct SimplifyCFGSimplifyArgument : UnitTest {
     auto *passToRun = cast<SILFunctionTransform>(createSimplifyCFG());
     passToRun->injectPassManager(getPass()->getPassManager());
     passToRun->injectFunction(getFunction());
+    auto *block = arguments.takeBlock();
+    auto index = arguments.takeUInt();
     SimplifyCFG(*getFunction(), *passToRun, /*VerifyAll=*/false,
                 /*EnableJumpThread=*/false)
-        .simplifyArgument(arguments.takeBlock(), arguments.takeUInt());
+        .simplifyArgument(block, index);
   }
 };
 

test/SILOptimizer/simplify_cfg_ossa_bbargs.sil

@@ -1,8 +1,5 @@
 // RUN: %target-sil-opt -unit-test-runner %s | %FileCheck %s
 
-// Test fails in Windows CI - rdar://104021173
-// UNSUPPORTED: OS=windows-msvc
-
 import Builtin
 
 class Klass {}