Try -fno-builtin to solve prefetch conflicts on MSVC ARM

This comes from a name‐collision between Clang’s own ARM prefetch builtin (__prefetch) and the declaration that MSVC’s <intrin.h> injects for the same symbol under extern "C"
llvm/llvm-project#87515

Author: aaronj0

unittests/CppInterOp/ScopeReflectionTest.cpp

@@ -168,7 +168,7 @@ TEST(ScopeReflectionTest, IsBuiltin) {
   //  "int", "unsigned int", "long", "unsigned long", "long long", "unsigned long long",
   //  "float", "double", "long double", "void"}
 
-  std::vector<const char*> interpreter_args = { "-include", "new" };
+  std::vector<const char*> interpreter_args = {"-fno-builtin", "-include", "new" };
 
   Cpp::CreateInterpreter(interpreter_args);
   ASTContext &C = Interp->getCI()->getASTContext();