Add -Werror to ensure there are no unused option warnings

Author: nikic

clang/test/Driver/clang_wrapv_opts.c

@@ -1,20 +1,20 @@
-// RUN: %clang -### -S -fwrapv -fno-wrapv -fwrapv %s 2>&1 | FileCheck -check-prefix=CHECK1 %s
+// RUN: %clang -### -S -fwrapv -fno-wrapv -fwrapv -Werror %s 2>&1 | FileCheck -check-prefix=CHECK1 %s
 // CHECK1: "-fwrapv"
 //
-// RUN: %clang -### -S -fwrapv-pointer -fno-wrapv-pointer -fwrapv-pointer %s 2>&1 | FileCheck -check-prefix=CHECK1-POINTER %s
+// RUN: %clang -### -S -fwrapv-pointer -fno-wrapv-pointer -fwrapv-pointer -Werror %s 2>&1 | FileCheck -check-prefix=CHECK1-POINTER %s
 // CHECK1-POINTER: "-fwrapv-pointer"
 //
-// RUN: %clang -### -S -fstrict-overflow -fno-strict-overflow %s 2>&1 | FileCheck -check-prefix=CHECK2 %s
+// RUN: %clang -### -S -fstrict-overflow -fno-strict-overflow -Werror %s 2>&1 | FileCheck -check-prefix=CHECK2 %s
 // CHECK2: "-fwrapv"{{.*}}"-fwrapv-pointer"
 //
-// RUN: %clang -### -S -fwrapv -fstrict-overflow %s 2>&1 | FileCheck -check-prefix=CHECK3 %s --implicit-check-not="-fwrapv-pointer"
+// RUN: %clang -### -S -fwrapv -fstrict-overflow -Werror -Werror %s 2>&1 | FileCheck -check-prefix=CHECK3 %s --implicit-check-not="-fwrapv-pointer"
 // CHECK3: "-fwrapv"
 //
-// RUN: %clang -### -S -fwrapv-pointer -fstrict-overflow %s 2>&1 | FileCheck -check-prefix=CHECK3-POINTER %s --implicit-check-not="-fwrapv"
+// RUN: %clang -### -S -fwrapv-pointer -fstrict-overflow -Werror %s 2>&1 | FileCheck -check-prefix=CHECK3-POINTER %s --implicit-check-not="-fwrapv"
 // CHECK3-POINTER: "-fwrapv-pointer"
 //
-// RUN: %clang -### -S -fno-wrapv -fno-strict-overflow %s 2>&1 | FileCheck -check-prefix=CHECK4 %s --implicit-check-not="-fwrapv"
+// RUN: %clang -### -S -fno-wrapv -fno-strict-overflow -Werror %s 2>&1 | FileCheck -check-prefix=CHECK4 %s --implicit-check-not="-fwrapv"
 // CHECK4: "-fwrapv-pointer"
 //
-// RUN: %clang -### -S -fno-wrapv-pointer -fno-strict-overflow %s 2>&1 | FileCheck -check-prefix=CHECK4-POINTER %s --implicit-check-not="-fwrapv-pointer"
+// RUN: %clang -### -S -fno-wrapv-pointer -fno-strict-overflow -Werror %s 2>&1 | FileCheck -check-prefix=CHECK4-POINTER %s --implicit-check-not="-fwrapv-pointer"
 // CHECK4-POINTER: "-fwrapv"