Indentation for long metatable items' definition

For example,

```
.method public static pinvokeimpl("msvcrt.dll" ansi cdecl)
vararg int32 sscanf(string,int8*) cil managed preservesig {}
```

should be indented exactly like that.

Start by locating the indentation entry point in the Emacs mode and reproduce the long metatable definition shown in the issue. Done means the vararg line is indented exactly as in the example, with no regression for related definitions.

Written by the indexing model from the issue text.