silence gcc warnings

src/mesa/shader/slang/slang_assemble_constructor.c

@@ -261,6 +261,8 @@ int _slang_assemble_constructor_from_swizzle (slang_assembly_file *file, const s
 	case slang_spec_vec4:
 		master_rows = 4;
 		break;
+	default:
+	   break;
 	}
 	for (i = 0; i < master_rows; i++)
 	{
@@ -290,6 +292,8 @@ int _slang_assemble_constructor_from_swizzle (slang_assembly_file *file, const s
 				(master_rows - i) * 4, i * 4))
 				return 0;
 			break;
+		default:
+		      break;
 		}
 	}
 	if (!slang_assembly_file_push_label (file, slang_asm_local_free, 4))
@@ -326,6 +330,8 @@ int _slang_assemble_constructor_from_swizzle (slang_assembly_file *file, const s
 			if (!slang_assembly_file_push (file, slang_asm_float_deref))
 				return 0;
 			break;
+		default:
+		   break;
 		}
 	}
 	return 1;

src/mesa/shader/slang/slang_assemble_typeinfo.c

@@ -395,6 +395,8 @@ int _slang_typeof_operation (slang_operation *op, slang_assembly_name_space *spa
 						break;
 					}
 					break;
+				default:
+				   break;
 				}
 			}
 			slang_assembly_typeinfo_destruct (&_ti);

src/mesa/shader/slang/slang_execute.c

@@ -154,6 +154,8 @@ static void dump_instruction (FILE *f, slang_assembly *a, unsigned int i)
 	case slang_asm_exit:
 		fprintf (f, "exit");
 		break;
+	default:
+	   break;
 	}
 
 	fprintf (f, "\n");