[Issue 18489] [REG 2.073]Internal error: dmd/backend/cgcod.c 1688

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18489

bitter.taste at gmx.com changed:

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                 CC|                            |bitter.taste at gmx.com

--- Comment #1 from bitter.taste at gmx.com ---
More codegen bugs, cool.

Here's [1] the culprit, the problem is the following:
```
a is fastpar and using register XMM1
__a_8 is fastpar and using register NOREG
```

The latter _should_ be the second half of the `a' parameter, I don't know if
the NOREG is right here.

[1]
https://github.com/dlang/dmd/blob/e439e910f344359456da9bef0df2a842020831dd/src/dmd/backend/cod1.c#L4768,L4772

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