Feature check CPI up front (#11652)

programs/bpf_loader/src/syscalls.rs

@@ -94,12 +94,10 @@ pub fn register_syscalls<'a>(
     )?;
     if invoke_context.is_cross_program_supported() {
         vm.register_syscall_ex("sol_create_program_address", syscall_create_program_address)?;
-    }
 
         // Cross-program invocation syscalls
 
         let invoke_context = Rc::new(RefCell::new(invoke_context));
-
         vm.register_syscall_with_context_ex(
             "sol_invoke_signed_c",
             Box::new(SyscallProcessSolInstructionC {
@@ -114,6 +112,7 @@ pub fn register_syscalls<'a>(
                 invoke_context: invoke_context.clone(),
             }),
         )?;
+    }
 
     // Memory allocator
     let heap = vec![0_u8; DEFAULT_HEAP_SIZE];