[m-dev.] diff: test cases for .agc bugs.

[Fergus Henderson]

Tyson Richard DOWD, you wrote:
> 
> 	Can someone review these? They are the test cases for the bugs
> 	I recently fixed.
...
> Add test cases for recently accurate garbage collection compilation
> problems.
...
>  # some regression tests only failed with particular options enabled
>  # (please keep this list sorted)
> +MCFLAGS-agc_unbound_typevars	= --grade asm_fast.agc
> +MCFLAGS-agc_unused_in		= --grade asm_fast.agc

I think you also need to set MGNUCFLAGS and MLFLAGS for those modules.
In fact, it is probably best to override the GRADE variable for
those modules rather than overriding MCFLAGS, MGNUCFLAGS, and MLFLAGS.
Use the same technique that is used to override MCFLAGS.

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