[Issue 21471] New: Backend assertion triggered with `-checkation=context` and `-inline`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21471

          Issue ID: 21471
           Summary: Backend assertion triggered with `-checkation=context`
                    and `-inline`
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Keywords: backend, wrong-code
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: pro.mathias.lang at gmail.com

```
// REQUIRED_ARGS: -checkaction=context -inline

struct S
{
    S get()() const { return this; }
}

auto f(S s) { return s; }

void main()
{
    auto s = S();

    assert(f(s.get) == s);
}
```

See https://github.com/dlang/dmd/pull/11925#issuecomment-722400704
Note that if the compiler wasn't compiler with asserts on, no failure happens,
hence the "wrong-code" tag.

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