This commit changes infix patterns to utilize `lrdrNameToTextAnn`. This
function allows the logic to avoid introspecting on the constructor
name.
Additionally this adds spaces to all infix operator pattern matches.
Previously infix symbols did not include spaces:
```
foo (x:xs) = _
```
Now they include a space
```
foo (x : xs) = _
```
This fix does not work on ghc-8.0, because I do not understand
the 8.0 API in this instance. Could be resolved by looking
at annotations, but that really should not be necessary.
Lennart Spitzner
Evan Rutledge Borden