Fix memref-stride-calculation on Windows

Call llvm::outs().flush() to make sure we don't mix streams.
Remove CHECK-LABEL to avoid assuming the relative order
between the additional info and the output IR.

PiperOrigin-RevId: 271131100

mlir/test/AffineOps/memref-stride-calculation.mlir

@@ -1,7 +1,6 @@
 // RUN: mlir-opt %s -test-memref-stride-calculation | FileCheck %s
 
 func @f(%0: index) {
-// CHECK-LABEL: func @f(
   %1 = alloc() : memref<3x4x5xf32>
 // CHECK: MemRefType offset: 0 strides: 20, 5, 1
   %2 = alloc(%0) : memref<3x4x?xf32>

mlir/test/lib/Transforms/TestMemRefStrideCalculation.cpp

@@ -57,6 +57,7 @@ void TestMemRefStrideCalculation::runOnFunction() {
     });
     llvm::outs() << "\n";
   });
+  llvm::outs().flush();
 }
 
 static PassRegistration<TestMemRefStrideCalculation>