const_if_match

The tracking issue for this feature is: #49146

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Allows for the use of conditionals (if and match) in a const context. Const contexts include static, static mut, const, const fn, const generics, and array initializers. Enabling this feature flag will also make && and || function normally in a const-context by removing the hack that replaces them with their non-short-circuiting equivalents, & and |, in a const or static.