Simplify "" string code

src/llvm_backend.cpp

@@ -4558,10 +4558,6 @@ lbValue lb_emit_clamp(lbProcedure *p, Type *t, lbValue x, lbValue min, lbValue m
 
 
 LLVMValueRef lb_find_or_add_entity_string_ptr(lbModule *m, String const &str) {
-	if (str.len == 0) {
-		return LLVMConstNull(lb_type(m, t_u8_ptr));
-	}
-
 	StringHashKey key = string_hash_string(str);
 	LLVMValueRef *found = string_map_get(&m->const_strings, key);
 	if (found != nullptr) {
@@ -4591,10 +4587,12 @@ LLVMValueRef lb_find_or_add_entity_string_ptr(lbModule *m, String const &str) {
 }
 
 lbValue lb_find_or_add_entity_string(lbModule *m, String const &str) {
-	if (str.len == 0) {
-		return lb_zero(m, t_string);
+	LLVMValueRef ptr = nullptr;
+	if (str.len != 0) {
+		ptr = lb_find_or_add_entity_string_ptr(m, str);
+	} else {
+		ptr = LLVMConstNull(lb_type(m, t_u8_ptr));
 	}
-	LLVMValueRef ptr = lb_find_or_add_entity_string_ptr(m, str);
 	LLVMValueRef str_len = LLVMConstInt(lb_type(m, t_int), str.len, true);
 	LLVMValueRef values[2] = {ptr, str_len};
 
@@ -4605,10 +4603,6 @@ lbValue lb_find_or_add_entity_string(lbModule *m, String const &str) {
 }
 
 lbValue lb_find_or_add_entity_string_byte_slice(lbModule *m, String const &str) {
-	if (str.len == 0) {
-		return lb_zero(m, t_u8_slice);
-	}
-
 	LLVMValueRef indices[2] = {llvm_zero(m), llvm_zero(m)};
 	LLVMValueRef data = LLVMConstStringInContext(m->ctx,
 		cast(char const *)str.text,
@@ -4628,7 +4622,12 @@ lbValue lb_find_or_add_entity_string_byte_slice(lbModule *m, String const &str)
 	LLVMSetInitializer(global_data, data);
 	LLVMSetLinkage(global_data, LLVMInternalLinkage);
 
-	LLVMValueRef ptr = LLVMConstInBoundsGEP(global_data, indices, 2);
+	LLVMValueRef ptr = nullptr;
+	if (str.len != 0) {
+		ptr = LLVMConstInBoundsGEP(global_data, indices, 2);
+	} else {
+		ptr = LLVMConstNull(lb_type(m, t_u8_ptr));
+	}
 	LLVMValueRef len = LLVMConstInt(lb_type(m, t_int), str.len, true);
 	LLVMValueRef values[2] = {ptr, len};