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Implement more ExactSizeIterators on 64-bit platforms #369

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@yhx-12243

Description

@yhx-12243

Proposal

Implement more ExactSizeIterators on 64-bit platforms

Problem statement

As rust-lang/rust#124056 mentioned, in 64-bit platforms, Range<i64>, Range<u64>, RangeInclusive<i32> and RangeInclusive<u32> can implement ExactSizeIterator and it will be convenient for many operations.

Solution sketch

Just add the implementation and #cfg[]s like other snippets in the same file.

Possible responses

This may break some API when depends hard-wired requirement that it is not implemented, such as
https://github.com/rust-lang/rustc-rayon/blob/f192a484741522bccb411cb5f1da9ec9577d6e27/src/range.rs#L296-L299 ,

But in my opinion, such code is written not very good and can be improved.

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    T-libs-apiapi-change-proposalA proposal to add or alter unstable APIs in the standard libraries

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