gc-sections is slow on Windows, which is the only reason
it's not enabled yet. I have a local optimized branch of
binutils that I have gotten the go ahead to try to upstream.
This is to check the difference on harbormaster.
Do not merge yet.
|No Unit Test Coverage|
|Build 49112: [GHC] Linux/amd64: Continuous Integration|
|Build 49111: [GHC] OSX/amd64: Continuous Integration|
|Build 49110: [GHC] Windows/amd64: Continuous Integration|
|Build 49109: arc lint + arc unit|