Add non-failing test

Author: abhishek-kaushik22

clang/test/CodeGen/target-features-no-error-2.c

@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 %s -triple=x86_64-linux-gnu -emit-llvm -verify -o /dev/null
+
+typedef double __v2df __attribute__((__vector_size__(16)));
+
+__v2df __attribute__((target("sse4.1"))) foo() {
+    __v2df v = {0.0, 0.0};
+    return __builtin_ia32_roundpd(v, 2);
+}
+
+__v2df __attribute__((target("sse4.1"), flatten)) bar() {
+    return foo(); // expected-no-diagnostics
+}