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Add -fdefer-diagnostics to defer and group diagnostic messages in make-mode

Zejun Wu requested to merge watashi/ghc:defer_diagnostics into master

When loading many modules in parallel there can a lot of warnings and errors get mixed up with regular output. When the compilation fails, the relevant error message can be thousands of lines backward and is hard to find. When the compilation successes, warning message is likely to be ignored as it is not seen. We can address this by deferring the warning and error message after the compilation. We also put errors after warnings so it is more visible.

This idea was originally proposed by Bartosz Nitka in https://phabricator.haskell.org/D4219.

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Edited by Zejun Wu

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