Fix suboptimal_float not linting on {const}.powf({const})

[lukaslueg]

There used to be an early return if the receiver was an effective const but the method was not linted, not taking into account later cases where the receiver and the arguments are both effective consts for different methods. Removed the early return.

Fixes #9402
Fixes #9201

changelog: Fix suboptimal_flops, imprecise_flops not linting on {const}.powf({const}) et al

[rust-highfive]

r? @giraffate

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[giraffate]

Overall looks good, thanks! I made one comment.

[lukaslueg]

Good catch, I didn't see that there were two distinct lints. Both get triggered in the same execution path though.

[giraffate]

@bors r+

Thanks!

[bors]

📌 Commit 6e14e60 has been approved by giraffate

It is now in the queue for this repository.

[bors]

⌛ Testing commit 6e14e60 with merge a80e278...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: giraffate
Pushing a80e278 to master...