Misleading unnecessary braces warning

Const generics, combined with the cfg! macro gives an "unnecessary braces" warning. However, removing the braces results in a compilation failure.

Example:

I expect no warning to be emitted for the following code:

pub fn foo<const BAR: bool> () {}

pub fn main() {
    // warning: unnecessary braces around const expression
    foo::<{cfg!(feature = "foo")}>();
}

Rollup merge of rust-lang#105515 - estebank:issue-104141, r=oli-obk

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