[REG2.066a] Issue 13087 - Error: no property 'xyz' for type 'Vec!4'

https://issues.dlang.org/show_bug.cgi?id=13087

While I fixing the bug, I found another ICE issue in `runnable/template9.d`.
[Issue 13088](https://issues.dlang.org/show_bug.cgi?id=13088) - Compiler segfaults with trivial case code.