[K/N][Tests] Use runProcess in doFileCheck

^KT-61259

compiler/testData/codegen/box/fileCheck/filecheck_expected_failure.kt

@@ -0,0 +1,8 @@
+// TARGET_BACKEND: NATIVE
+// IGNORE_BACKEND: NATIVE
+// FILECHECK_STAGE: CStubs
+
+// The check below is intentionally wrong and must fail.
+// Test system should report test as passed due to IGNORE_BACKEND directive above.
+// CHECK-LABEL: NONEXISTENT
+fun box(): String = "OK"