[Vulkan] Implemented do/while loops for shaders

servers/visual/rasterizer_rd/shader_compiler_rd.cpp

@@ -752,6 +752,10 @@ String ShaderCompilerRD::_dump_node_code(const SL::Node *p_node, int p_level, Ge
 					code += _mktab(p_level) + "else\n";
 					code += _dump_node_code(cfnode->blocks[1], p_level + 1, r_gen_code, p_actions, p_default_actions, p_assigning);
 				}
+			} else if (cfnode->flow_op == SL::FLOW_OP_DO) {
+				code += _mktab(p_level) + "do";
+				code += _dump_node_code(cfnode->blocks[0], p_level + 1, r_gen_code, p_actions, p_default_actions, p_assigning);
+				code += _mktab(p_level) + "while (" + _dump_node_code(cfnode->expressions[0], p_level, r_gen_code, p_actions, p_default_actions, p_assigning) + ");";
 			} else if (cfnode->flow_op == SL::FLOW_OP_WHILE) {
 
 				code += _mktab(p_level) + "while (" + _dump_node_code(cfnode->expressions[0], p_level, r_gen_code, p_actions, p_default_actions, p_assigning) + ")\n";