[PowerPC] add testcaseis for PPC, NFC

For builtin __builtin_cpu_is and __builtin_cpu_supports

clang/test/Sema/builtin-cpu-supports.c

@@ -2,6 +2,9 @@
 // RUN: %clang_cc1 -fsyntax-only -triple aarch64-linux-gnu -verify %s
 // RUN: %clang_cc1 -fsyntax-only -triple riscv32-linux-gnu -verify %s
 // RUN: %clang_cc1 -fsyntax-only -triple riscv64-linux-gnu -verify %s
+// RUN: %clang_cc1 -fsyntax-only -triple powerpc64le-unknown-linux -verify %s
+// RUN: %clang_cc1 -fsyntax-only -triple powerpc64-unknown-aix7.2.0.0 -verify %s
+// RUN: %clang_cc1 -fsyntax-only -triple powerpc-unknown-aix7.2.0.0 -verify %s
 
 extern void a(const char *);
 
@@ -45,5 +48,16 @@ int main(void) {
     a("vsx");
 #endif
 
+#ifdef __powerpc__
+  if (__builtin_cpu_is("garbage")) // expected-error {{invalid cpu name for builtin}}
+    a("vsx");
+
+  if (__builtin_cpu_is("power3")) // expected-error {{invalid cpu name for builtin}}
+    a("vsx");
+
+  if (__builtin_cpu_supports("garbage")) // expected-warning {{invalid cpu feature string for builtin}}
+    a("vsx");
+#endif
+
   return 0;
 }