Add test case for r194593

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194606 91177308-0d34-0410-b5e6-96231b3b80d8

test/Driver/arm-restrict-it.c

+// RUN: %clang -target arm-none-gnueabi -mrestrict-it -### %s 2> %t
+// RUN: FileCheck --check-prefix=CHECK-RESTRICTED < %t %s
+
+// RUN: %clang -target armv8a-none-gnueabi -mrestrict-it -### %s 2> %t
+// RUN: FileCheck --check-prefix=CHECK-RESTRICTED < %t %s
+
+// CHECK-RESTRICTED: "-backend-option" "-arm-restrict-it"
+
+// RUN: %clang -target arm-none-gnueabi -mno-restrict-it -### %s 2> %t
+// RUN: FileCheck --check-prefix=CHECK-NO-RESTRICTED < %t %s
+
+// RUN: %clang -target armv8a-none-gnueabi -mno-restrict-it -### %s 2> %t
+// RUN: FileCheck --check-prefix=CHECK-NO-RESTRICTED < %t %s
+
+// CHECK-NO-RESTRICTED: "-backend-option" "-arm-no-restrict-it"