generic size: avoid method static parameters and abstract type assert

The generic method `size(::AbstractArray, ::Any)` currently has:

* method static parameters

* an abstract type assert (`::Integer`) in the method body

PR JuliaLang#59442 aims to make this generic method be used for `Array` and
`Memory`, by deleting the more specific methods.

It is my understanding that method static parameters and abstract type
asserts can cause performance issues, when they're not optimized out,
which happens when the argument types are not concretely inferred.

So I'm putting up this PR, which eliminates the method static
parameters and the `typeassert`, to prevent any possible regressions
from PR JuliaLang#59442.

These seems like they might potentially cause regressions

Author: nsajko

base/abstractarray.jl

@@ -39,7 +39,13 @@ julia> size(A, 2)
 3
 ```
 """
-size(t::AbstractArray{T,N}, d) where {T,N} = d::Integer <= N ? size(t)[d] : 1
+function size(t::AbstractArray, d)
+    function f(t::Tuple, d::Integer)
+        d <= length(t) ? t[d] : 1
+    end
+    sz = size(t)
+    @inline f(sz, d)
+end
 
 """
     axes(A, d)