GHCs json profiling output is not escaped correctly.
## Summary
Quoting from [stack overflow](https://stackoverflow.com/questions/3020094/how-should-i-escape-strings-in-json)
```
JSON is pretty liberal: The only characters you must escape are \, ", and control codes (anything less than U+0020).
```
But GHC produces strings like:
```
"arguments": ["E:\ghc_inferTags\_prof\stage1\bin\ghc.exe", "-O", "-fforce-recomp", "Distribution/Compat/Lens.hs"],
```
## Steps to reproduce
Use +RTS -pj on a profiling enabled program.
## Expected behavior
The json should be properly escaped.
issue