Merge pull request #37559 from JuliaLang/teh/reinterpret_reshape

Fix the performance of `reinterpretarray` with simultaneous reshaping

Author: timholy

NEWS.md

@@ -83,6 +83,8 @@ New library features
 
 * The `redirect_*` functions can now be called on `IOContext` objects.
 * New constructor `NamedTuple(iterator)` that constructs a named tuple from a key-value pair iterator.
+* A new `reinterpret(reshape, T, a::AbstractArray{S})` reinterprets `a` to have eltype `T` while potentially
+  inserting or consuming the first dimension depending on the ratio of `sizeof(T)` and `sizeof(S)`.
 
 Standard library changes
 ------------------------