Ömer Sinan Ağacan authored Oct 22, 2019 and Marge Bot committed Oct 23, 2019

Previously -ddump-stg would dump pre and post-unarise STGs. Now we have
a new flag for post-unarise STG and -ddump-stg only dumps coreToStg
output.

STG dump flags after this commit:

- -ddump-stg: Dumps CoreToStg output
- -ddump-stg-unarised: Unarise output
- -ddump-stg-final: STG right before code gen (includes CSE and lambda
  lifting)