Add mir-gen-stub.c for s390x.
@@ -172,12 +172,14 @@ static inline struct gen_ctx **gen_ctx_loc (MIR_context_t ctx) { return (struct
#define max_int_hard_regs gen_ctx->max_int_hard_regs
#define max_fp_hard_regs gen_ctx->max_fp_hard_regs
-#ifdef __x86_64__
+#if defined(__x86_64__)
#include "mir-gen-x86_64.c"
#elif defined(__aarch64__)
#include "mir-gen-aarch64.c"
#elif defined(__PPC64__)
#include "mir-gen-ppc64.c"
+#elif defined(__s390x__)
+#include "mir-gen-stub.c"
#else
#error "undefined or unsupported generation target"
#endif
