Add miscellaneous Clippy 'corrections' pt. 2 (https://github.com/Shopify/zjit/pull/95)

* Remove immediately deferenced borrow operators

source: https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow

* Remove unnecessary cast as i64

Since Const::CInt64 wraps i64, it is unnecessary to cast to i64.

* Remove unnecessary borrow operators

* Beautify assign operation syntax

* Use .is_null() convenience method

* Omit .into() call from u32 to u32

* Use more descriptive std::ptr::null<VALUE>()

In lieu of casting a literal as a type, opt to use the convenience type.

* Use sized integer literal

* Simplify pattern matching to explicit check

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