Fix type `switch` debug information on `-o:none`

src/llvm_backend.cpp

@@ -1377,7 +1377,7 @@ gb_internal WORKER_TASK_PROC(lb_llvm_emit_worker_proc) {
 
 gb_internal void lb_llvm_function_pass_per_function_internal(lbModule *module, lbProcedure *p, lbFunctionPassManagerKind pass_manager_kind = lbFunctionPassManager_default) {
 	LLVMPassManagerRef pass_manager = module->function_pass_managers[pass_manager_kind];
-	lb_run_function_pass_manager(pass_manager, p);
+	lb_run_function_pass_manager(pass_manager, p, pass_manager_kind);
 }
 
 gb_internal WORKER_TASK_PROC(lb_llvm_function_pass_per_module) {
@@ -1911,7 +1911,7 @@ gb_internal lbProcedure *lb_create_main_procedure(lbModule *m, lbProcedure *star
 		LLVMVerifyFunction(p->value, LLVMAbortProcessAction);
 	}
 
-	lb_run_function_pass_manager(default_function_pass_manager, p);
+	lb_run_function_pass_manager(default_function_pass_manager, p, lbFunctionPassManager_default);
 	return p;
 }
 

src/llvm_backend_opt.cpp

@@ -370,11 +370,21 @@ gb_internal void lb_run_remove_dead_instruction_pass(lbProcedure *p) {
 }
 
 
-gb_internal void lb_run_function_pass_manager(LLVMPassManagerRef fpm, lbProcedure *p) {
+gb_internal void lb_run_function_pass_manager(LLVMPassManagerRef fpm, lbProcedure *p, lbFunctionPassManagerKind pass_manager_kind) {
 	if (p == nullptr) {
 		return;
 	}
 	LLVMRunFunctionPassManager(fpm, p->value);
+	switch (pass_manager_kind) {
+	case lbFunctionPassManager_none:
+		return;
+	case lbFunctionPassManager_default:
+	case lbFunctionPassManager_default_without_memcpy:
+		if (build_context.optimization_level < 0) {
+			return;
+		}
+		break;
+	}
 	// NOTE(bill): LLVMAddDCEPass doesn't seem to be exported in the official DLL's for LLVM
 	// which means we cannot rely upon it
 	// This is also useful for read the .ll for debug purposes because a lot of instructions