Add error test

Created using spr 1.3.6-beta.1

Author: wangpc-pp

clang/test/CodeGen/RISCV/builtin-cpu-is-error.c

@@ -0,0 +1,8 @@
+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 5
+// RUN: not %clang_cc1 -triple riscv64-unknown-linux-gnu -emit-llvm %s -o - 2>&1 \
+// RUN:   | FileCheck %s
+
+// CHECK: error: invalid cpu name for builtin
+int test_cpu_is_invalid_cpu() {
+  return __builtin_cpu_is("generic-rv64");
+}